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Variations of inReplyTo

The property is defined here. The goal of this support table is to show how applications react to inReplyTo containing a wide variation of allowed objects. As Fediverse applications generally only give one the option to reply to a single element, the lacking support should not be surprising.

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": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/j_J8bLCIsdw",
  "published": "2025-09-14T08:52:10Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/GDjnVfLLXng",
    "published": "2025-09-14T08:52:10Z",
    "content": "valid uri",
    "inReplyTo": "http://pasture-one-actor/assets/note1.jsonap",
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}

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": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/QNSf9lHdHk0",
  "published": "2025-09-14T08:52:22Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/em12jcy7zT4",
    "published": "2025-09-14T08:52:22Z",
    "content": "invalid uri",
    "inReplyTo": "http://invalid.example/",
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}

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": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/esfw1LywMww",
  "published": "2025-09-14T08:52:35Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/ckwubsASBc8",
    "published": "2025-09-14T08:52:35Z",
    "content": "list",
    "inReplyTo": [
      "http://pasture-one-actor/assets/note1.jsonap"
    ],
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}

Example 4

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/bCOrS0L9FNI",
  "published": "2025-09-14T08:52:48Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/V9rFxfTUnk0",
    "published": "2025-09-14T08:52:48Z",
    "content": "Link in inReplyTo",
    "inReplyTo": {
      "type": "Link",
      "href": "http://pasture-one-actor/assets/note1.jsonap"
    },
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}

Example 5

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/_3Ckby0NleQ",
  "published": "2025-09-14T08:53:00Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/yrh5zKgv7g0",
    "published": "2025-09-14T08:53:00Z",
    "content": "two elements in inReplyTo",
    "inReplyTo": [
      "http://pasture-one-actor/assets/note1.jsonap",
      "http://pasture-one-actor/assets/note2.jsonap"
    ],
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}

Example 6

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/Hkp1M-2a9W8",
  "published": "2025-09-14T08:53:13Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/-ChrdVHMm9g",
    "published": "2025-09-14T08:53:13Z",
    "content": "collection",
    "inReplyTo": {
      "type": "Collection",
      "items": [
        "http://pasture-one-actor/actor"
      ]
    },
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}

Example 7

activity
{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://pyfedi.local/c/pie",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/activity/lWuVQj3XeyE",
  "published": "2025-09-14T08:53:25Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://pyfedi.local/c/pie"
    ],
    "id": "http://pasture-one-actor/object/fFbEQUPNkT0",
    "published": "2025-09-14T08:53:25Z",
    "content": "embedded note",
    "inReplyTo": {
      "@context": "https://www.w3.org/ns/activitystreams",
      "type": "Note",
      "id": "http://pasture-one-actor/assets/note1.jsonap",
      "to": [
        "as:Public"
      ],
      "attributedTo": "http://pasture-one-actor/actor",
      "content": "One",
      "published": "2024-01-06T13:11:45Z"
    },
    "tag": [
      {
        "type": "Mention",
        "href": "http://pyfedi.local/c/pie"
      }
    ]
  }
}