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

```json title="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://mastodon/users/hippo"
  ],
  "id": "http://pasture_one_actor/actor/TOzAgN3kAFQ",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture_one_actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://mastodon/users/hippo"
    ],
    "id": "http://pasture_one_actor/actor/iFzK0Ghza_w",
    "published": "2024-03-06T16:43:13Z",
    "content": "https://www.w3.org/ns/activitystreams#Public"
  }
}
```


```json title="mastodon"
{
  "id": "112049743070943651",
  "created_at": "2024-03-06T16:43:13.000Z",
  "in_reply_to_id": null,
  "in_reply_to_account_id": null,
  "sensitive": false,
  "spoiler_text": "",
  "visibility": "public",
  "language": null,
  "uri": "http://pasture_one_actor/actor/iFzK0Ghza_w",
  "url": "http://pasture_one_actor/actor/iFzK0Ghza_w",
  "replies_count": 0,
  "reblogs_count": 0,
  "favourites_count": 0,
  "edited_at": null,
  "favourited": false,
  "reblogged": false,
  "muted": false,
  "bookmarked": false,
  "content": "https://www.w3.org/ns/activitystreams#Public",
  "filtered": [],
  "reblog": null,
  "account": {
    "id": "112049740239482109",
    "username": "actor",
    "acct": "actor@pasture_one_actor",
    "display_name": "Test Actor",
    "locked": false,
    "bot": false,
    "discoverable": false,
    "group": false,
    "created_at": "2024-03-06T00:00:00.000Z",
    "note": "",
    "url": "http://pasture_one_actor/actor",
    "uri": "http://pasture_one_actor/actor",
    "avatar": "http://mastodon/avatars/original/missing.png",
    "avatar_static": "http://mastodon/avatars/original/missing.png",
    "header": "http://mastodon/headers/original/missing.png",
    "header_static": "http://mastodon/headers/original/missing.png",
    "followers_count": 0,
    "following_count": 0,
    "statuses_count": 20,
    "last_status_at": "2024-03-06",
    "emojis": [],
    "fields": []
  },
  "media_attachments": [],
  "mentions": [],
  "tags": [],
  "emojis": [],
  "card": null,
  "poll": null
}
```

Example 2

```json title="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://mastodon/users/hippo"
  ],
  "id": "http://pasture_one_actor/actor/MBWTfA4U67Q",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture_one_actor/actor",
    "to": [
      "as:Public",
      "http://mastodon/users/hippo"
    ],
    "id": "http://pasture_one_actor/actor/FGMxfDqEGWU",
    "published": "2024-03-06T16:43:16Z",
    "content": "as:Public"
  }
}
```


```json title="mastodon"
{
  "id": "112049743220811919",
  "created_at": "2024-03-06T16:43:16.000Z",
  "in_reply_to_id": null,
  "in_reply_to_account_id": null,
  "sensitive": false,
  "spoiler_text": "",
  "visibility": "public",
  "language": null,
  "uri": "http://pasture_one_actor/actor/FGMxfDqEGWU",
  "url": "http://pasture_one_actor/actor/FGMxfDqEGWU",
  "replies_count": 0,
  "reblogs_count": 0,
  "favourites_count": 0,
  "edited_at": null,
  "favourited": false,
  "reblogged": false,
  "muted": false,
  "bookmarked": false,
  "content": "as:Public",
  "filtered": [],
  "reblog": null,
  "account": {
    "id": "112049740239482109",
    "username": "actor",
    "acct": "actor@pasture_one_actor",
    "display_name": "Test Actor",
    "locked": false,
    "bot": false,
    "discoverable": false,
    "group": false,
    "created_at": "2024-03-06T00:00:00.000Z",
    "note": "",
    "url": "http://pasture_one_actor/actor",
    "uri": "http://pasture_one_actor/actor",
    "avatar": "http://mastodon/avatars/original/missing.png",
    "avatar_static": "http://mastodon/avatars/original/missing.png",
    "header": "http://mastodon/headers/original/missing.png",
    "header_static": "http://mastodon/headers/original/missing.png",
    "followers_count": 0,
    "following_count": 0,
    "statuses_count": 21,
    "last_status_at": "2024-03-06",
    "emojis": [],
    "fields": []
  },
  "media_attachments": [],
  "mentions": [],
  "tags": [],
  "emojis": [],
  "card": null,
  "poll": null
}
```

Example 3

```json title="activity"
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture_one_actor/actor",
  "to": [
    "http://mastodon/users/hippo",
    "Public"
  ],
  "id": "http://pasture_one_actor/actor/1nHFMbarABs",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture_one_actor/actor",
    "to": [
      "Public",
      "http://mastodon/users/hippo"
    ],
    "id": "http://pasture_one_actor/actor/wY_fW9OFkcM",
    "published": "2024-03-06T16:43:18Z",
    "content": "Public"
  }
}
```


```json title="mastodon"
{
  "id": "112049743370637714",
  "created_at": "2024-03-06T16:43:18.000Z",
  "in_reply_to_id": null,
  "in_reply_to_account_id": null,
  "sensitive": false,
  "spoiler_text": "",
  "visibility": "public",
  "language": null,
  "uri": "http://pasture_one_actor/actor/wY_fW9OFkcM",
  "url": "http://pasture_one_actor/actor/wY_fW9OFkcM",
  "replies_count": 0,
  "reblogs_count": 0,
  "favourites_count": 0,
  "edited_at": null,
  "favourited": false,
  "reblogged": false,
  "muted": false,
  "bookmarked": false,
  "content": "Public",
  "filtered": [],
  "reblog": null,
  "account": {
    "id": "112049740239482109",
    "username": "actor",
    "acct": "actor@pasture_one_actor",
    "display_name": "Test Actor",
    "locked": false,
    "bot": false,
    "discoverable": false,
    "group": false,
    "created_at": "2024-03-06T00:00:00.000Z",
    "note": "",
    "url": "http://pasture_one_actor/actor",
    "uri": "http://pasture_one_actor/actor",
    "avatar": "http://mastodon/avatars/original/missing.png",
    "avatar_static": "http://mastodon/avatars/original/missing.png",
    "header": "http://mastodon/headers/original/missing.png",
    "header_static": "http://mastodon/headers/original/missing.png",
    "followers_count": 0,
    "following_count": 0,
    "statuses_count": 22,
    "last_status_at": "2024-03-06",
    "emojis": [],
    "fields": []
  },
  "media_attachments": [],
  "mentions": [],
  "tags": [],
  "emojis": [],
  "card": null,
  "poll": null
}
```