Hashtags

The following mostly illustrates how the name of a hashtag gets transformed by the applications. The input has the form

"tag": {"type": "Hashtag", "name": "${tag}"}

The last two examples illustrate more technical behavior.

Objects

Object 1

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/Q-b4-QyhC4I",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#test",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 2

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/gPJE1VNGPsc",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "nohash",
    "type": "Hashtag"
  },
  "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": "text",
  "id": "http://actor.example/lTrKyut_t0I",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#with-dash_under",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 4

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/HFiJqPl_81M",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#with white space",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 5

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/OGjoARh3hEw",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#with(subtag)",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 6

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/FdbhSLkqWdA",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#with123",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 7

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/srHfXkUo5QU",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#1234",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 8

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/Gst88Z2Z7kI",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#CamelCase",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 9

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/gPcgPjsMv9g",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#\u00fcml\u00e4\u00fct\u00df",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 10

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/tClYOzR9dOk",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#\ud83d\udc04",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 11

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/0ntcLTFAZJ8",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#\u2764\ufe0f",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 12

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/8B5XvOjTFWk",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#\u725b",
    "type": "Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 13

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/bfs1qY3-RHw",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#test",
    "type": "Hashtag",
    "url": "https://ignore.example"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 14

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/qY8WdIyNG0c",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#test",
    "type": "as:Hashtag"
  },
  "to": [
    "as:Public"
  ],
  "type": "Note"
}

Object 15

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "attributedTo": "http://actor.example",
  "content": "text",
  "id": "http://actor.example/Qs0eRsoxfbc",
  "published": "2025-07-15T09:07:23Z",
  "tag": {
    "name": "#test"
  },
  "to": [
    "as: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/IaUC1i8DoqE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/6b7l6QQihkw",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#test",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as: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/s-WE5gL7mRE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/RZ1pVETGbUM",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "nohash",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "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/X-lmNHEZ9Vs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/PbLXLXyY6YI",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#with-dash_under",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 4

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/jN77QQfmlC0",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/QNdlBGAL_-A",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#with white space",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 5

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/5_cZHxNfhAw",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/STnauanMWe0",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#with(subtag)",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 6

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/Z3JfbTzIaxg",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/oBzgMFzrukQ",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#with123",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 7

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/7pOKexmBZuM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/BZ66qvAtXvc",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#1234",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 8

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/MPh-tI-BOlA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/lX4cihrIkxI",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#CamelCase",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 9

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/-xGxtDjzxGM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/UBNE-pKtJ-w",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#\u00fcml\u00e4\u00fct\u00df",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 10

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/OwlOL5koxog",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/NkZ_Qi_sIA0",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#\ud83d\udc04",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 11

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/Q2LtFuSwcsk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/wrBv-3kAgE4",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#\u2764\ufe0f",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 12

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/ejQBq386fQE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/Zf7YKOHa-3E",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#\u725b",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 13

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/PUQCE2XKIUM",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/j_Ud3eFGqVY",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#test",
      "type": "Hashtag",
      "url": "https://ignore.example"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 14

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/AXunENts-WI",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/4GrXFS0P17Y",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#test",
      "type": "as:Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}

Activity 15

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "actor": "http://actor.example",
  "id": "http://actor.example/DHQ6f8X8nho",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/QbXPpqSFN0w",
    "published": "2025-07-15T09:07:23Z",
    "tag": {
      "name": "#test"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-07-15T09:07:23Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}