Fediverse Developers

This page is mainly for outlining the activities and circumstances Mbin sends out activities and how activities, objects and actors are represented. To communicate between instances, Mbin utilizes the ActivityPub protocol (ActivityPub standard, ActivityPub vocabulary) and the FEP Group federation.

Context

The @context property for all Mbin payloads should be this:

[
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    "https://mbin.example/contexts"
]

The /contexts endpoint resolves to this:

[
    {
        "ostatus": "http://ostatus.org#",
        "schema": "http://schema.org#",
        "toot": "http://joinmastodon.org/ns#",
        "pt": "https://joinpeertube.org/ns#",
        "lemmy": "https://join-lemmy.org/ns#",
        "Hashtag": "as:Hashtag",
        "PropertyValue": "schema:PropertyValue",
        "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
        "sensitive": "as:sensitive",
        "value": "schema:value",
        "blurhash": "toot:blurhash",
        "focalPoint": "toot:focalPoint",
        "votersCount": "toot:votersCount",
        "featured": "toot:featured",
        "commentsEnabled": "pt:commentsEnabled",
        "postingRestrictedToMods": "lemmy:postingRestrictedToMods",
        "stickied": "lemmy:stickied"
    }
]

Actors

The actors Mbin uses are

the Instance actor (AP Application)
the User actor (AP Person)
the Magazine actor (AP Group)

Instance Actor

Each instance has an instance actor at https://instance.tld/i/actor and https://instance.tld (they are the same):

{
    "id": "https://mbin.example/i/actor",
    "type": "Application",
    "name": "Mbin",
    "inbox": "https://mbin.example/i/inbox",
    "outbox": "https://mbin.example/i/outbox",
    "preferredUsername": "kbin.test",
    "manuallyApprovesFollowers": true,
    "publicKey": {
        "id": "https://mbin.example/i/actor#main-key",
        "owner": "https://mbin.example/i/actor",
        "publicKeyPem": "-----BEGIN PUBLIC KEY-----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\r\ndG7BpuX6Rlslxd3Z1hbz1cECAwEAAQ==\r\n-----END PUBLIC KEY-----"
    },
    "published": "2026-04-08T08:20:35+00:00"
}

User actor

Each registered user has an AP actor at https://instance.tld/u/username:

{
    "id": "https://mbin.example/u/BentiGorlich",
    "type": "Person",
    "name": "BentiGorlich",
    "preferredUsername": "BentiGorlich",
    "inbox": "https://mbin.example/u/BentiGorlich/inbox",
    "outbox": "https://mbin.example/u/BentiGorlich/outbox",
    "url": "https://mbin.example/u/BentiGorlich",
    "manuallyApprovesFollowers": false,
    "discoverable": true,
    "indexable": true,
    "published": "2026-04-08T08:20:35+00:00",
    "following": "https://mbin.example/u/BentiGorlich/following",
    "followers": "https://mbin.example/u/BentiGorlich/followers",
    "publicKey": {
        "owner": "https://mbin.example/u/BentiGorlich",
        "id": "https://mbin.example/u/BentiGorlich#main-key",
        "publicKeyPem": "-----BEGIN PUBLIC KEY-----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\r\nj4iQEkYWgSce6Gs9UobkqkECAwEAAQ==\r\n-----END PUBLIC KEY-----"
    },
    "endpoints": {
        "sharedInbox": "https://mbin.example/f/inbox"
    },
    "image": {
        "type": "Image",
        "url": "https://kbin.test/media/a441b15fe9a3cf56661190a0b93b9dec7d04127288cc87250967cf3b52894d11"
    },
    "icon": {
        "type": "Image",
        "url": "https://kbin.test/media/a441b15fe9a3cf56661190a0b93b9dec7d04127288cc87250967cf3b52894d11"
    }
}

Magazine actor

Each magazine has an AP actor at https://instance.tld/m/name:

{
    "type": "Group",
    "id": "https://mbin.example/m/melroyMag",
    "name": "Melroys Magazine",
    "preferredUsername": "melroyMag",
    "inbox": "https://mbin.example/m/melroyMag/inbox",
    "outbox": "https://mbin.example/m/melroyMag/outbox",
    "followers": "https://mbin.example/m/melroyMag/followers",
    "featured": "https://mbin.example/m/melroyMag/pinned",
    "url": "https://mbin.example/m/melroyMag",
    "publicKey": {
        "owner": "https://mbin.example/m/melroyMag",
        "id": "https://mbin.example/m/melroyMag#main-key",
        "publicKeyPem": "-----BEGIN PUBLIC KEY-----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\r\nmnsnsqn9Xese3ttMiHBFpWcCAwEAAQ==\r\n-----END PUBLIC KEY-----"
    },
    "summary": "<p>Melroys wonderful magazine</p>\n",
    "source": {
        "content": "Melroys wonderful magazine",
        "mediaType": "text/markdown"
    },
    "sensitive": false,
    "attributedTo": "https://mbin.example/m/melroyMag/moderators",
    "postingRestrictedToMods": false,
    "discoverable": true,
    "indexable": true,
    "endpoints": {
        "sharedInbox": "https://mbin.example/f/inbox"
    },
    "published": "2026-04-08T08:20:38+00:00",
    "updated": "2026-04-08T08:20:40+00:00",
    "icon": {
        "type": "Image",
        "url": "https://kbin.test/media/a441b15fe9a3cf56661190a0b93b9dec7d04127288cc87250967cf3b52894d11"
    }
}

Objects

Threads

{
    "id": "https://mbin.example/m/melroyMag/t/1",
    "type": "Page",
    "attributedTo": "https://mbin.example/u/BentiGorlich",
    "inReplyTo": null,
    "to": [
        "https://mbin.example/m/melroyMag",
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "name": "Bentis thread",
    "audience": "https://mbin.example/m/melroyMag",
    "content": "<p>Bentis thread in melroys magazine</p>\n",
    "summary": "Bentis thread #melroyMag",
    "mediaType": "text/html",
    "source": {
        "content": "Bentis thread in melroys magazine",
        "mediaType": "text/markdown"
    },
    "tag": [
        {
            "type": "Hashtag",
            "href": "https://mbin.example/tag/melroyMag",
            "name": "#melroyMag"
        }
    ],
    "commentsEnabled": true,
    "sensitive": false,
    "stickied": true,
    "published": "2026-04-08T08:20:39+00:00",
    "contentMap": {
        "en": "<p>Bentis thread in melroys magazine</p>\n"
    }
}

Comments on threads

{
    "id": "https://mbin.example/m/melroyMag/t/1/-/comment/1",
    "type": "Note",
    "attributedTo": "https://mbin.example/u/Melroy",
    "inReplyTo": "https://mbin.example/m/melroyMag/t/1",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public",
        "https://mbin.example/u/BentiGorlich"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag",
        "https://mbin.example/u/Melroy/followers"
    ],
    "audience": "https://mbin.example/m/melroyMag",
    "sensitive": false,
    "content": "<p>melroys comment</p>\n",
    "mediaType": "text/html",
    "source": {
        "content": "melroys comment",
        "mediaType": "text/markdown"
    },
    "url": "https://mbin.example/m/melroyMag/t/1/-/comment/1",
    "tag": [
        {
            "type": "Hashtag",
            "href": "https://mbin.example/tag/melroyMag",
            "name": "#melroyMag"
        },
        {
            "type": "Mention",
            "href": "https://mbin.example/u/BentiGorlich",
            "name": "@BentiGorlich@mbin.example"
        }
    ],
    "published": "2026-04-08T08:20:39+00:00",
    "contentMap": {
        "en": "<p>melroys comment</p>\n"
    }
}

Microblogs

{
    "id": "https://mbin.example/m/melroyMag/p/1",
    "type": "Note",
    "attributedTo": "https://mbin.example/u/BentiGorlich",
    "inReplyTo": null,
    "to": [
        "https://mbin.example/m/melroyMag",
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "audience": "https://mbin.example/m/melroyMag",
    "sensitive": false,
    "stickied": false,
    "content": "<p>Melroys post</p>\n<p><a href=\"https://mbin.example/tag/melroyMag\">#melroyMag</a></p>\n",
    "mediaType": "text/html",
    "source": {
        "content": "Melroys post\n\n #melroyMag",
        "mediaType": "text/markdown"
    },
    "url": "https://mbin.example/m/melroyMag/p/1",
    "tag": [
        {
            "type": "Hashtag",
            "href": "https://mbin.example/tag/melroyMag",
            "name": "#melroyMag"
        }
    ],
    "commentsEnabled": true,
    "published": "2026-04-08T08:20:39+00:00",
    "contentMap": {
        "en": "<p>Melroys post</p>\n<p><a href=\"https://mbin.example/tag/melroyMag\">#melroyMag</a></p>\n"
    }
}

Comments on microblogs

{
    "id": "https://mbin.example/m/melroyMag/p/1/-/reply/1",
    "type": "Note",
    "attributedTo": "https://mbin.example/u/BentiGorlich",
    "inReplyTo": "https://mbin.example/m/melroyMag/p/1",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public",
        "https://mbin.example/u/BentiGorlich"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag",
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "audience": "https://mbin.example/m/melroyMag",
    "sensitive": false,
    "content": "<p>Bentis post comment</p>\n",
    "mediaType": "text/html",
    "source": {
        "content": "Bentis post comment",
        "mediaType": "text/markdown"
    },
    "url": "https://mbin.example/m/melroyMag/p/1/-/reply/1",
    "tag": [
        {
            "type": "Hashtag",
            "href": "https://mbin.example/tag/melroyMag",
            "name": "#melroyMag"
        }
    ],
    "published": "2026-04-08T08:20:40+00:00",
    "contentMap": {
        "en": "<p>Bentis post comment</p>\n"
    }
}

Private message

{
    "id": "https://mbin.example/message/e6f97aad-5bed-49b7-bb7c-e6f91a7906f3",
    "attributedTo": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://mbin.example/u/Melroy"
    ],
    "cc": [],
    "type": "ChatMessage",
    "published": "2026-04-08T08:20:40+00:00",
    "content": "<p>Bentis message</p>\n",
    "mediaType": "text/html",
    "source": {
        "mediaType": "text/markdown",
        "content": "Bentis message"
    }
}

Collections

User Outbox

{
    "type": "OrderedCollection",
    "id": "https://mbin.example/u/BentiGorlich/outbox",
    "first": "https://mbin.example/u/BentiGorlich/outbox?page=1",
    "totalItems": 3
}

First Page:

{
    "type": "OrderedCollectionPage",
    "partOf": "https://mbin.example/u/BentiGorlich/outbox",
    "id": "https://mbin.example/u/BentiGorlich/outbox?page=1",
    "totalItems": 3,
    "orderedItems": [
        {
            "id": "https://mbin.example/f/object/019d6c2d-e3f4-76f7-b618-215bfe87ef2b",
            "type": "Create",
            "actor": "https://mbin.example/u/BentiGorlich",
            "published": "2026-04-08T08:20:40+00:00",
            "to": [
                "https://www.w3.org/ns/activitystreams#Public",
                "https://mbin.example/u/BentiGorlich"
            ],
            "cc": [
                "https://mbin.example/m/melroyMag",
                "https://mbin.example/u/BentiGorlich/followers"
            ],
            "object": {
                "id": "https://mbin.example/m/melroyMag/p/1/-/reply/1",
                "type": "Note",
                "attributedTo": "https://mbin.example/u/BentiGorlich",
                "inReplyTo": "https://mbin.example/m/melroyMag/p/1",
                "to": [
                    "https://www.w3.org/ns/activitystreams#Public",
                    "https://mbin.example/u/BentiGorlich"
                ],
                "cc": [
                    "https://mbin.example/m/melroyMag",
                    "https://mbin.example/u/BentiGorlich/followers"
                ],
                "audience": "https://mbin.example/m/melroyMag",
                "sensitive": false,
                "content": "<p>Bentis post comment</p>\n",
                "mediaType": "text/html",
                "source": {
                    "content": "Bentis post comment",
                    "mediaType": "text/markdown"
                },
                "url": "https://mbin.example/m/melroyMag/p/1/-/reply/1",
                "tag": [
                    {
                        "type": "Hashtag",
                        "href": "https://mbin.example/tag/melroyMag",
                        "name": "#melroyMag"
                    }
                ],
                "published": "2026-04-08T08:20:40+00:00",
                "contentMap": {
                    "en": "<p>Bentis post comment</p>\n"
                }
            },
            "audience": "https://mbin.example/m/melroyMag"
        },
        {
            "id": "https://mbin.example/f/object/019d6c2d-e3cb-7953-8cac-656d55ee1bcc",
            "type": "Create",
            "actor": "https://mbin.example/u/BentiGorlich",
            "published": "2026-04-08T08:20:39+00:00",
            "to": [
                "https://mbin.example/m/melroyMag",
                "https://www.w3.org/ns/activitystreams#Public"
            ],
            "cc": [
                "https://mbin.example/u/BentiGorlich/followers"
            ],
            "object": {
                "id": "https://mbin.example/m/melroyMag/p/1",
                "type": "Note",
                "attributedTo": "https://mbin.example/u/BentiGorlich",
                "inReplyTo": null,
                "to": [
                    "https://mbin.example/m/melroyMag",
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "cc": [
                    "https://mbin.example/u/BentiGorlich/followers"
                ],
                "audience": "https://mbin.example/m/melroyMag",
                "sensitive": false,
                "stickied": false,
                "content": "<p>Melroys post</p>\n<p><a href=\"https://mbin.example/tag/melroyMag\">#melroyMag</a></p>\n",
                "mediaType": "text/html",
                "source": {
                    "content": "Melroys post\n\n #melroyMag",
                    "mediaType": "text/markdown"
                },
                "url": "https://mbin.example/m/melroyMag/p/1",
                "tag": [
                    {
                        "type": "Hashtag",
                        "href": "https://mbin.example/tag/melroyMag",
                        "name": "#melroyMag"
                    }
                ],
                "commentsEnabled": true,
                "published": "2026-04-08T08:20:39+00:00",
                "contentMap": {
                    "en": "<p>Melroys post</p>\n<p><a href=\"https://mbin.example/tag/melroyMag\">#melroyMag</a></p>\n"
                }
            },
            "audience": "https://mbin.example/m/melroyMag"
        },
        {
            "id": "https://mbin.example/f/object/019d6c2d-e37b-741d-bf7e-3fd9f3a7d94a",
            "type": "Create",
            "actor": "https://mbin.example/u/BentiGorlich",
            "published": "2026-04-08T08:20:39+00:00",
            "to": [
                "https://mbin.example/m/melroyMag",
                "https://www.w3.org/ns/activitystreams#Public"
            ],
            "cc": [
                "https://mbin.example/u/BentiGorlich/followers"
            ],
            "object": {
                "id": "https://mbin.example/m/melroyMag/t/1",
                "type": "Page",
                "attributedTo": "https://mbin.example/u/BentiGorlich",
                "inReplyTo": null,
                "to": [
                    "https://mbin.example/m/melroyMag",
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "cc": [
                    "https://mbin.example/u/BentiGorlich/followers"
                ],
                "name": "Bentis thread",
                "audience": "https://mbin.example/m/melroyMag",
                "content": "<p>Bentis thread in melroys magazine</p>\n",
                "summary": "Bentis thread #melroyMag",
                "mediaType": "text/html",
                "source": {
                    "content": "Bentis thread in melroys magazine",
                    "mediaType": "text/markdown"
                },
                "tag": [
                    {
                        "type": "Hashtag",
                        "href": "https://mbin.example/tag/melroyMag",
                        "name": "#melroyMag"
                    }
                ],
                "commentsEnabled": true,
                "sensitive": false,
                "stickied": true,
                "published": "2026-04-08T08:20:39+00:00",
                "contentMap": {
                    "en": "<p>Bentis thread in melroys magazine</p>\n"
                }
            },
            "audience": "https://mbin.example/m/melroyMag"
        }
    ]
}

User Followers

{
    "type": "OrderedCollection",
    "id": "https://mbin.example/u/BentiGorlich/followers",
    "first": "https://mbin.example/u/BentiGorlich/followers?page=1",
    "totalItems": 2
}

User Followings

{
    "type": "OrderedCollection",
    "id": "https://mbin.example/u/BentiGorlich/following",
    "first": "https://mbin.example/u/BentiGorlich/following?page=1",
    "totalItems": 0
}

Magazine Outbox

The magazine outbox endpoint does technically exist, but it just returns an empty JSON object at the moment.

{}

Magazine Moderators

The moderators collection contains all moderators and is not paginated:

{
    "type": "OrderedCollection",
    "id": "https://mbin.example/m/melroyMag/moderators",
    "totalItems": 1,
    "orderedItems": [
        "https://mbin.example/u/BentiGorlich"
    ]
}

Magazine Featured

The featured collection contains all threads and is not paginated:

{
    "type": "OrderedCollection",
    "id": "https://mbin.example/m/melroyMag/pinned",
    "totalItems": 1,
    "orderedItems": [
        {
            "id": "https://mbin.example/m/melroyMag/t/1",
            "type": "Page",
            "attributedTo": "https://mbin.example/u/BentiGorlich",
            "inReplyTo": null,
            "to": [
                "https://mbin.example/m/melroyMag",
                "https://www.w3.org/ns/activitystreams#Public"
            ],
            "cc": [
                "https://mbin.example/u/BentiGorlich/followers"
            ],
            "name": "Bentis thread",
            "audience": "https://mbin.example/m/melroyMag",
            "content": "<p>Bentis thread in melroys magazine</p>\n",
            "summary": "Bentis thread #melroyMag",
            "mediaType": "text/html",
            "source": {
                "content": "Bentis thread in melroys magazine",
                "mediaType": "text/markdown"
            },
            "tag": [
                {
                    "type": "Hashtag",
                    "href": "https://mbin.example/tag/melroyMag",
                    "name": "#melroyMag"
                }
            ],
            "commentsEnabled": true,
            "sensitive": false,
            "stickied": true,
            "published": "2026-04-08T08:20:39+00:00",
            "contentMap": {
                "en": "<p>Bentis thread in melroys magazine</p>\n"
            }
        }
    ]
}

Magazine Followers

The followers collection does not contain items, it only shows the number of subscribed users:

{
    "@context": [
        "https://www.w3.org/ns/activitystreams",
        "https://w3id.org/security/v1",
        "https://mbin.example/contexts"
    ],
    "type": "OrderedCollection",
    "id": "https://mbin.example/m/melroyMag/followers",
    "first": "https://mbin.example/m/melroyMag/followers?page=1",
    "totalItems": 1
}

User Activities

Follow and unfollow

If the user wants to follow another user or magazine:

{
    "id": "https://mbin.example/f/object/019d6c2d-e486-7dd5-b72e-92ea808eedee",
    "type": "Follow",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": "https://mbin.example/u/Melroy",
    "to": [
        "https://mbin.example/u/Melroy"
    ]
}

If the user stops following another user or magazine:

{
    "id": "https://mbin.example/f/object/019d6c2d-e48c-735f-bb1d-557d3dc20928",
    "type": "Undo",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": {
        "id": "https://mbin.example/f/object/019d6c2d-e486-7dd5-b72e-92ea808eedee",
        "type": "Follow",
        "actor": "https://mbin.example/u/BentiGorlich",
        "object": "https://mbin.example/u/Melroy",
        "to": [
            "https://mbin.example/u/Melroy"
        ]
    },
    "to": [
        "https://mbin.example/u/Melroy"
    ],
    "cc": []
}

Accept and Reject

Mbin automatically sends an Accept activity when a user receives a Follow activity.

{
    "id": "https://mbin.example/f/object/019d6c2d-e491-799c-8bd8-3d8a561f128a",
    "type": "Accept",
    "actor": "https://mbin.example/u/Melroy",
    "object": {
        "id": "https://mbin.example/f/object/019d6c2d-e486-7dd5-b72e-92ea808eedee",
        "type": "Follow",
        "actor": "https://mbin.example/u/BentiGorlich",
        "object": "https://mbin.example/u/Melroy",
        "to": [
            "https://mbin.example/u/Melroy"
        ]
    },
    "to": [
        "https://mbin.example/u/BentiGorlich"
    ]
}

Create

{
    "id": "https://mbin.example/f/object/019d6c2d-e37b-741d-bf7e-3fd9f3a7d94a",
    "type": "Create",
    "actor": "https://mbin.example/u/BentiGorlich",
    "published": "2026-04-08T08:20:39+00:00",
    "to": [
        "https://mbin.example/m/melroyMag",
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "object": {
        "id": "https://mbin.example/m/melroyMag/t/1",
        "type": "Page",
        "attributedTo": "https://mbin.example/u/BentiGorlich",
        "inReplyTo": null,
        "to": [
            "https://mbin.example/m/melroyMag",
            "https://www.w3.org/ns/activitystreams#Public"
        ],
        "cc": [
            "https://mbin.example/u/BentiGorlich/followers"
        ],
        "name": "Bentis thread",
        "audience": "https://mbin.example/m/melroyMag",
        "content": "<p>Bentis thread in melroys magazine</p>\n",
        "summary": "Bentis thread #melroyMag",
        "mediaType": "text/html",
        "source": {
            "content": "Bentis thread in melroys magazine",
            "mediaType": "text/markdown"
        },
        "tag": [
            {
                "type": "Hashtag",
                "href": "https://mbin.example/tag/melroyMag",
                "name": "#melroyMag"
            }
        ],
        "commentsEnabled": true,
        "sensitive": false,
        "stickied": true,
        "published": "2026-04-08T08:20:39+00:00",
        "contentMap": {
            "en": "<p>Bentis thread in melroys magazine</p>\n"
        }
    },
    "audience": "https://mbin.example/m/melroyMag"
}

Report

{
    "id": "https://mbin.example/f/object/019d6c2d-e496-7f92-bdd1-1081122fdd50",
    "type": "Flag",
    "actor": "https://mbin.example/u/Melroy",
    "object": "https://mbin.example/m/melroyMag/t/1",
    "audience": "https://mbin.example/m/melroyMag",
    "summary": "Spam",
    "content": "Spam",
    "to": [
        "https://mbin.example/m/melroyMag"
    ]
}

Vote

When a user votes it is translated to a Like activity for an up-vote and a Dislike activity for a down-vote. Down-votes are not federated, yet.

{
    "id": "https://mbin.example/f/object/019d6c2d-e4a4-7929-9b16-f5f76c1a45a5",
    "type": "Like",
    "actor": "https://mbin.example/u/Melroy",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/Melroy/followers",
        "https://mbin.example/m/melroyMag"
    ],
    "object": "https://mbin.example/m/melroyMag/t/1",
    "audience": "https://mbin.example/m/melroyMag"
}

If the vote is removed:

{
    "id": "https://mbin.example/f/object/019d6c2d-e4aa-7c5e-b3bf-d27d6ecc3ce7",
    "type": "Undo",
    "actor": "https://mbin.example/u/Melroy",
    "object": {
        "id": "https://mbin.example/f/object/019d6c2d-e4a4-7929-9b16-f5f76c1a45a5",
        "type": "Like",
        "actor": "https://mbin.example/u/Melroy",
        "to": [
            "https://www.w3.org/ns/activitystreams#Public"
        ],
        "cc": [
            "https://mbin.example/u/Melroy/followers",
            "https://mbin.example/m/melroyMag"
        ],
        "object": "https://mbin.example/m/melroyMag/t/1",
        "audience": "https://mbin.example/m/melroyMag"
    },
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/Melroy/followers",
        "https://mbin.example/m/melroyMag"
    ],
    "audience": "https://mbin.example/m/melroyMag"
}

Boost

If a user boosts content:

{
    "id": "https://mbin.example/f/object/019d6c2d-e4b8-78a6-9ff8-ebf2c224deaa",
    "type": "Announce",
    "actor": "https://mbin.example/u/Melroy",
    "object": "https://mbin.example/m/melroyMag/t/1",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/Melroy/followers"
    ],
    "published": "2026-04-08T08:20:40+00:00"
}

Edit account

{
    "id": "https://mbin.example/f/object/019d6c2d-e4be-7754-9621-29f600754662",
    "type": "Update",
    "actor": "https://mbin.example/u/Melroy",
    "published": "2026-04-08T08:20:37+00:00",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/Melroy/followers"
    ],
    "object": {
        "id": "https://mbin.example/u/Melroy",
        "type": "Person",
        "name": "Melroy",
        "preferredUsername": "Melroy",
        "inbox": "https://mbin.example/u/Melroy/inbox",
        "outbox": "https://mbin.example/u/Melroy/outbox",
        "url": "https://mbin.example/u/Melroy",
        "manuallyApprovesFollowers": false,
        "discoverable": true,
        "indexable": true,
        "published": "2026-04-08T08:20:37+00:00",
        "following": "https://mbin.example/u/Melroy/following",
        "followers": "https://mbin.example/u/Melroy/followers",
        "publicKey": {
            "owner": "https://mbin.example/u/Melroy",
            "id": "https://mbin.example/u/Melroy#main-key",
            "publicKeyPem": "-----BEGIN PUBLIC KEY-----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\r\n0W2FalK9udlkZYXMpVMJNqUCAwEAAQ==\r\n-----END PUBLIC KEY-----"
        },
        "endpoints": {
            "sharedInbox": "https://mbin.example/f/inbox"
        },
        "image": {
            "type": "Image",
            "url": "https://kbin.test/media/a441b15fe9a3cf56661190a0b93b9dec7d04127288cc87250967cf3b52894d11"
        },
        "icon": {
            "type": "Image",
            "url": "https://kbin.test/media/a441b15fe9a3cf56661190a0b93b9dec7d04127288cc87250967cf3b52894d11"
        }
    }
}

Edit content

{
    "id": "https://mbin.example/f/object/019d6c2d-e4c4-7698-8965-69c0b1412789",
    "type": "Update",
    "actor": "https://mbin.example/u/BentiGorlich",
    "published": "2026-04-08T08:20:39+00:00",
    "to": [
        "https://mbin.example/m/melroyMag",
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "object": {
        "id": "https://mbin.example/m/melroyMag/t/1",
        "type": "Page",
        "attributedTo": "https://mbin.example/u/BentiGorlich",
        "inReplyTo": null,
        "to": [
            "https://mbin.example/m/melroyMag",
            "https://www.w3.org/ns/activitystreams#Public"
        ],
        "cc": [
            "https://mbin.example/u/BentiGorlich/followers"
        ],
        "name": "Bentis thread",
        "audience": "https://mbin.example/m/melroyMag",
        "content": "<p>Bentis thread in melroys magazine</p>\n",
        "summary": "Bentis thread #melroyMag",
        "mediaType": "text/html",
        "source": {
            "content": "Bentis thread in melroys magazine",
            "mediaType": "text/markdown"
        },
        "tag": [
            {
                "type": "Hashtag",
                "href": "https://mbin.example/tag/melroyMag",
                "name": "#melroyMag"
            }
        ],
        "commentsEnabled": true,
        "sensitive": false,
        "stickied": true,
        "published": "2026-04-08T08:20:39+00:00",
        "contentMap": {
            "en": "<p>Bentis thread in melroys magazine</p>\n"
        },
        "object": {
            "updated": "2026-04-08T08:20:40+00:00"
        }
    },
    "audience": "https://mbin.example/m/melroyMag"
}

Delete content

{
    "id": "https://mbin.example/f/object/019d6c2d-e4d2-76ab-b25f-39a4436d1271",
    "type": "Delete",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": {
        "id": "https://mbin.example/m/melroyMag/t/1",
        "type": "Tombstone"
    },
    "to": [
        "https://mbin.example/m/melroyMag",
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ]
}

Delete own account

{
    "id": "https://mbin.example/f/object/019d6c2d-e4de-7401-88d1-234575cf50fe",
    "type": "Delete",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "removeData": true
}

Lock own content

Only top level content (meaning no comments) can be locked. When content is locked, comments can no longer be created for it.

{
    "id": "https://mbin.example/f/object/019d6c2d-e4ea-702a-b3c9-a7d32bed846b",
    "type": "Lock",
    "actor": "https://mbin.example/u/Melroy",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag",
        "https://mbin.example/u/Melroy/followers"
    ],
    "object": "https://mbin.example/m/melroyMag/t/1"
}

Moderator Activities

Add or Remove moderator

When a moderator is added:

{
    "id": "https://mbin.example/f/object/019d6c2d-e4f0-7b04-9f2c-694df5aa1b82",
    "actor": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "object": "https://mbin.example/u/Melroy",
    "cc": [
        "https://mbin.example/m/melroyMag"
    ],
    "type": "Add",
    "target": "https://mbin.example/m/melroyMag/moderators",
    "audience": "https://mbin.example/m/melroyMag"
}

When a moderator is removed:

{
    "id": "https://mbin.example/f/object/019d6c2d-e4f8-738b-85bd-7476ef9a1984",
    "actor": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "object": "https://mbin.example/u/Melroy",
    "cc": [
        "https://mbin.example/m/melroyMag"
    ],
    "type": "Remove",
    "target": "https://mbin.example/m/melroyMag/moderators",
    "audience": "https://mbin.example/m/melroyMag"
}

Pin or Unpin a thread

When a thread is pinned:

{
    "id": "https://mbin.example/f/object/019d6c2d-e4fe-78f4-88e9-095ae093af42",
    "actor": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "object": "https://mbin.example/m/melroyMag/t/1",
    "cc": [
        "https://mbin.example/m/melroyMag"
    ],
    "type": "Add",
    "target": "https://mbin.example/m/melroyMag/pinned",
    "audience": "https://mbin.example/m/melroyMag"
}

When a thread is unpinned:

{
    "id": "https://mbin.example/f/object/019d6c2d-e505-70b7-b650-fdc53382246f",
    "actor": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "object": "https://mbin.example/m/melroyMag/t/1",
    "cc": [
        "https://mbin.example/m/melroyMag"
    ],
    "type": "Remove",
    "target": "https://mbin.example/m/melroyMag/pinned",
    "audience": "https://mbin.example/m/melroyMag"
}

Delete content

{
    "id": "https://mbin.example/f/object/019d6c2d-e515-7c4f-b2c3-8c324dcb08e3",
    "type": "Delete",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": {
        "id": "https://mbin.example/m/melroyMag/t/1/-/comment/1",
        "type": "Tombstone"
    },
    "to": [
        "https://www.w3.org/ns/activitystreams#Public",
        "https://mbin.example/u/BentiGorlich"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag",
        "https://mbin.example/u/Melroy/followers"
    ],
    "summary": " "
}

Ban user from magazine

{
    "id": "https://mbin.example/f/object/019d6c2d-e527-7eff-95b3-47268ecdd436",
    "type": "Block",
    "actor": "https://mbin.example/u/Melroy",
    "object": "https://mbin.example/u/BentiGorlich",
    "target": "https://mbin.example/m/melroyMag",
    "summary": "A very specific reason",
    "audience": "https://mbin.example/m/melroyMag",
    "expires": "2025-01-01T08:20:40+00:00",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag"
    ]
}

Lock content

When content is locked, comments can no longer be created for it.

{
    "id": "https://mbin.example/f/object/019d6c2d-e528-7082-aad6-9a680cd1450f",
    "type": "Lock",
    "actor": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag",
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "object": "https://mbin.example/m/melroyMag/t/1"
}

Admin Activities

Ban user from instance

{
    "id": "https://mbin.example/f/object/019d6c2d-e536-7950-9457-57670b31c91d",
    "type": "Block",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": "https://mbin.example/u/Melroy",
    "target": "https://kbin.test",
    "summary": null,
    "audience": null,
    "expires": null,
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": []
}

Delete account

If an admin deletes another user's account the activity actually does not reflect that, it looks exactly as if the user deleted their own account.

{
    "id": "https://mbin.example/f/object/019d6c2d-e536-7a54-9457-57670bf559a5",
    "type": "Delete",
    "actor": "https://mbin.example/u/BentiGorlich",
    "object": "https://mbin.example/u/BentiGorlich",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "removeData": true
}

Magazine Activities

Announce activities

The magazine is mainly there to announce the activities users do with it as the audience. The announced type can be Create, Update, Add, Remove, Announce, Delete, Like, Dislike, Flag and Lock. Announce(Flag) activities are only sent to instances with moderators of this magazine on them.

{
    "id": "https://mbin.example/f/object/019d6c2d-e52f-7c77-9d46-e8d71dbbbbfe",
    "type": "Announce",
    "actor": "https://mbin.example/m/melroyMag",
    "object": {
        "id": "https://mbin.example/f/object/019d6c2d-e37b-741d-bf7e-3fd9f3a7d94a",
        "type": "Create",
        "actor": "https://mbin.example/u/BentiGorlich",
        "published": "2026-04-08T08:20:39+00:00",
        "to": [
            "https://mbin.example/m/melroyMag",
            "https://www.w3.org/ns/activitystreams#Public"
        ],
        "cc": [
            "https://mbin.example/u/BentiGorlich/followers"
        ],
        "object": {
            "id": "https://mbin.example/m/melroyMag/t/1",
            "type": "Page",
            "attributedTo": "https://mbin.example/u/BentiGorlich",
            "inReplyTo": null,
            "to": [
                "https://mbin.example/m/melroyMag",
                "https://www.w3.org/ns/activitystreams#Public"
            ],
            "cc": [
                "https://mbin.example/u/BentiGorlich/followers"
            ],
            "name": "Bentis thread",
            "audience": "https://mbin.example/m/melroyMag",
            "content": "<p>Bentis thread in melroys magazine</p>\n",
            "summary": "Bentis thread #melroyMag",
            "mediaType": "text/html",
            "source": {
                "content": "Bentis thread in melroys magazine",
                "mediaType": "text/markdown"
            },
            "tag": [
                {
                    "type": "Hashtag",
                    "href": "https://mbin.example/tag/melroyMag",
                    "name": "#melroyMag"
                }
            ],
            "commentsEnabled": true,
            "sensitive": false,
            "stickied": true,
            "published": "2026-04-08T08:20:39+00:00",
            "contentMap": {
                "en": "<p>Bentis thread in melroys magazine</p>\n"
            }
        },
        "audience": "https://mbin.example/m/melroyMag"
    },
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://mbin.example/m/melroyMag/followers",
        "https://mbin.example/u/BentiGorlich/followers"
    ],
    "published": "2026-04-08T08:20:40+00:00",
    "audience": "https://mbin.example/m/melroyMag"
}

Context​

Actors​

Instance Actor​

User actor​

Magazine actor​

Objects​

Threads​

Comments on threads​

Microblogs​

Comments on microblogs​

Private message​

Collections​

User Outbox​

User Followers​

User Followings​

Magazine Outbox​

Magazine Moderators​

Magazine Featured​

Magazine Followers​

User Activities​

Follow and unfollow​

Accept and Reject​

Create​

Report​

Vote​

Boost​

Edit account​

Edit content​

Delete content​

Delete own account​

Lock own content​

Moderator Activities​

Add or Remove moderator​

Pin or Unpin a thread​

Delete content​

Ban user from magazine​

Lock content​

Admin Activities​

Ban user from instance​

Delete account​

Magazine Activities​

Announce activities​

Context

Actors

Instance Actor

User actor

Magazine actor

Objects

Threads

Comments on threads

Microblogs

Comments on microblogs

Private message

Collections

User Outbox

User Followers

User Followings

Magazine Outbox

Magazine Moderators

Magazine Featured

Magazine Followers

User Activities

Follow and unfollow

Accept and Reject

Create

Report

Vote

Boost

Edit account

Edit content

Delete content

Delete own account

Lock own content

Moderator Activities

Add or Remove moderator

Pin or Unpin a thread

Delete content

Ban user from magazine

Lock content

Admin Activities

Ban user from instance

Delete account

Magazine Activities

Announce activities