Public addressing

Public addressing is discussed here. The essential point here is that Public, as:Public, and https://www.w3.org/ns/activitystreams#Public are equivalent as JSON-LD and thus should be treated in the same way by Fediverse applications.

Examples

Example 1

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/acbvxoc67a2y0003"
  ],
  "id": "http://pasture-one-actor/activity/qqt1a_2UqoA",
  "published": "2025-09-06T13:51:46Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/acbvxoc67a2y0003"
    ],
    "id": "http://pasture-one-actor/object/Jdi_xnpmxw8",
    "published": "2025-09-06T13:51:46Z",
    "content": "https://www.w3.org/ns/activitystreams#Public"
  }
}

misskey

{
  "id": "acbw011snd1t001p",
  "createdAt": "2025-09-06T13:51:46.000Z",
  "userId": "acbvz9wond1t0003",
  "user": {
    "id": "acbvz9wond1t0003",
    "name": "Test Actor",
    "username": "actor",
    "host": "pasture-one-actor",
    "avatarUrl": "http://misskey/identicon/actor@pasture-one-actor",
    "avatarBlurhash": null,
    "avatarDecorations": [],
    "isBot": false,
    "isCat": false,
    "instance": {
      "name": null,
      "softwareName": null,
      "softwareVersion": null,
      "iconUrl": null,
      "faviconUrl": null,
      "themeColor": null
    },
    "emojis": {},
    "onlineStatus": "unknown"
  },
  "text": "https://www.w3.org/ns/activitystreams#Public",
  "cw": null,
  "visibility": "public",
  "localOnly": false,
  "reactionAcceptance": null,
  "renoteCount": 0,
  "repliesCount": 0,
  "reactionCount": 0,
  "reactions": {},
  "reactionEmojis": {},
  "emojis": {},
  "fileIds": [],
  "files": [],
  "replyId": null,
  "renoteId": null,
  "uri": "http://pasture-one-actor/object/Jdi_xnpmxw8",
  "clippedCount": 0
}

Example 2

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "as:Public",
    "http://misskey/users/acbvxoc67a2y0003"
  ],
  "id": "http://pasture-one-actor/activity/0fVvWpjJ-RQ",
  "published": "2025-09-06T13:51:46Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "as:Public",
      "http://misskey/users/acbvxoc67a2y0003"
    ],
    "id": "http://pasture-one-actor/object/6LqcLHw19NI",
    "published": "2025-09-06T13:51:46Z",
    "content": "as:Public"
  }
}

misskey

{
  "id": "acbw011snd1t001q",
  "createdAt": "2025-09-06T13:51:46.000Z",
  "userId": "acbvz9wond1t0003",
  "user": {
    "id": "acbvz9wond1t0003",
    "name": "Test Actor",
    "username": "actor",
    "host": "pasture-one-actor",
    "avatarUrl": "http://misskey/identicon/actor@pasture-one-actor",
    "avatarBlurhash": null,
    "avatarDecorations": [],
    "isBot": false,
    "isCat": false,
    "instance": {
      "name": null,
      "softwareName": null,
      "softwareVersion": null,
      "iconUrl": null,
      "faviconUrl": null,
      "themeColor": null
    },
    "emojis": {},
    "onlineStatus": "unknown"
  },
  "text": "as:Public",
  "cw": null,
  "visibility": "public",
  "localOnly": false,
  "reactionAcceptance": null,
  "renoteCount": 0,
  "repliesCount": 0,
  "reactionCount": 0,
  "reactions": {},
  "reactionEmojis": {},
  "emojis": {},
  "fileIds": [],
  "files": [],
  "replyId": null,
  "renoteId": null,
  "uri": "http://pasture-one-actor/object/6LqcLHw19NI",
  "clippedCount": 0
}

Example 3

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "Public",
    "http://misskey/users/acbvxoc67a2y0003"
  ],
  "id": "http://pasture-one-actor/activity/3vOZ86n1cKU",
  "published": "2025-09-06T13:51:47Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "Public",
      "http://misskey/users/acbvxoc67a2y0003"
    ],
    "id": "http://pasture-one-actor/object/QbkItkAWY-I",
    "published": "2025-09-06T13:51:47Z",
    "content": "Public"
  }
}

misskey

{
  "id": "acbw01tknd1t001r",
  "createdAt": "2025-09-06T13:51:47.000Z",
  "userId": "acbvz9wond1t0003",
  "user": {
    "id": "acbvz9wond1t0003",
    "name": "Test Actor",
    "username": "actor",
    "host": "pasture-one-actor",
    "avatarUrl": "http://misskey/identicon/actor@pasture-one-actor",
    "avatarBlurhash": null,
    "avatarDecorations": [],
    "isBot": false,
    "isCat": false,
    "instance": {
      "name": null,
      "softwareName": null,
      "softwareVersion": null,
      "iconUrl": null,
      "faviconUrl": null,
      "themeColor": null
    },
    "emojis": {},
    "onlineStatus": "unknown"
  },
  "text": "Public",
  "cw": null,
  "visibility": "public",
  "localOnly": false,
  "reactionAcceptance": null,
  "renoteCount": 0,
  "repliesCount": 0,
  "reactionCount": 0,
  "reactions": {},
  "reactionEmojis": {},
  "emojis": {},
  "fileIds": [],
  "files": [],
  "replyId": null,
  "renoteId": null,
  "uri": "http://pasture-one-actor/object/QbkItkAWY-I",
  "clippedCount": 0
}