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.

Support Table Preview

to	Object	Activity
https://www.w3.org/ns/activitystreams#Public	Object	Activity
as:Public	Object	Activity
Public	Object	Activity

Objects

Object 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "https://www.w3.org/ns/activitystreams#Public",
  "id": "http://actor.example/object/4SbxYqqRSE8",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "type": "Note"
}

Object 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "as:Public",
  "id": "http://actor.example/object/nqmE1hsBiB4",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 3

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "Public",
  "id": "http://actor.example/object/kArQi5gNLdY",
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "Public"
  ],
  "type": "Note"
}

Activities

Activity 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/E5-JXm3IJAY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "https://www.w3.org/ns/activitystreams#Public",
    "id": "http://actor.example/object/4HvkA-rnmrM",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/tQxbxDhKTMk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "as:Public",
    "id": "http://actor.example/object/THHl2_lNYyg",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "http://remote.example/",
    "as:Public"
  ],
  "type": "Create"
}

Activity 3

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/activity/FJRbKxjMGWY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "Public",
    "id": "http://actor.example/object/i4CaQoZW0co",
    "published": "2025-10-04T11:50:25Z",
    "to": [
      "Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-10-04T11:50:25Z",
  "to": [
    "Public",
    "http://remote.example/"
  ],
  "type": "Create"
}