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/object/NUBxgbKRZdA",
  "published": "2025-08-15T08:43:29Z",
  "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/object/QLGnxlu-hkw",
  "published": "2025-08-15T08:43:29Z",
  "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/object/Hzwk-GM3rP4",
  "published": "2025-08-15T08:43:29Z",
  "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/object/bG4HFvO2NTU",
  "published": "2025-08-15T08:43:29Z",
  "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/object/mbAHpbnSocI",
  "published": "2025-08-15T08:43:29Z",
  "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/object/qqi26ZAbXiQ",
  "published": "2025-08-15T08:43:29Z",
  "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/object/-JF4i-IPR8s",
  "published": "2025-08-15T08:43:29Z",
  "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/object/nRQZTvGyuk0",
  "published": "2025-08-15T08:43:29Z",
  "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/object/0U0ZDPsS9Rw",
  "published": "2025-08-15T08:43:29Z",
  "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/object/9gpjYjUEBEs",
  "published": "2025-08-15T08:43:29Z",
  "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/object/L9EQxCtQBq0",
  "published": "2025-08-15T08:43:29Z",
  "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/object/CCvSOZsqDJo",
  "published": "2025-08-15T08:43:29Z",
  "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/object/CetvL2LfwQw",
  "published": "2025-08-15T08:43:29Z",
  "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/object/Cn8mv8tQou4",
  "published": "2025-08-15T08:43:29Z",
  "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/object/3JevT7cu554",
  "published": "2025-08-15T08:43:29Z",
  "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/activity/NDcvV2AImio",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/HnWSoKto-rk",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#test",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/LLIetdUIEfc",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/eNlPpv9xIXQ",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "nohash",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/f2S0z7nfitY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/BJEEtPM7Xdw",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#with-dash_under",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/JxxTuq07qnk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/7oaf6SMg7Do",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#with white space",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/Ae61jXScVGA",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/97-aQxUrBFQ",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#with(subtag)",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/fvi6hrNjUCY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/_TzPg7Wt6yg",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#with123",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/DEsnpA51_Fs",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/4n5-MFfQzsU",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#1234",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/mOd2zCCsaT8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/uEVP1XzTd34",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#CamelCase",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/ZKLTEIWgBls",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/mh6j2RK0Cbc",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#\u00fcml\u00e4\u00fct\u00df",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/BCroO35BED8",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/YYFk2nANpbc",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#\ud83d\udc04",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/JJKfq9YXcsk",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/SwG8Qol2gT0",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#\u2764\ufe0f",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/u1LMqMC9gcQ",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/nBWIU6uDmHk",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#\u725b",
      "type": "Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/8ek5GK4FVfY",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/qMWppG67DXs",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#test",
      "type": "Hashtag",
      "url": "https://ignore.example"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/JPbOrYm73Es",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/eiYuuMgopjI",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#test",
      "type": "as:Hashtag"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "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/activity/t7v8Q3kRQIE",
  "object": {
    "attributedTo": "http://actor.example",
    "content": "text",
    "id": "http://actor.example/object/iBMa7Df8ffw",
    "published": "2025-08-15T08:43:29Z",
    "tag": {
      "name": "#test"
    },
    "to": [
      "as:Public",
      "http://remote.example/"
    ],
    "type": "Note"
  },
  "published": "2025-08-15T08:43:29Z",
  "to": [
    "as:Public",
    "http://remote.example/"
  ],
  "type": "Create"
}