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A study of ActivityPub

A series of observations about ActivityPub against similar technologies.

Message post format and size

Email

https://tools.ietf.org/html/rfc5322#appendix-A.1.1

From: John Doe <johndoe@example.org>
To: Room35 <room35@example.org>
Subject: None
Date: Fri, 21 Nov 1997 09:55:06 -0600
Message-ID: <1234@local.machine.example>

hello

169 characters

Matrix

https://matrix.org/docs/spec/client_server/r0.6.1#put-matrix-client-r0-rooms-roomid-send-eventtype-txnid

PUT /_matrix/client/r0/rooms/%21636q39766251%3Aexample.com/send/m.room.message/35

{
  "msgtype": "m.text",
  "body": "hello"
}

128 characters

ActivityPub

https://www.w3.org/TR/activitypub/#obj https://www.w3.org/TR/activitystreams-vocabulary/#dfn-note https://www.w3.org/TR/activitystreams-vocabulary/#object-types https://www.w3.org/TR/activitypub/#object-without-create

POST /@johndoe/outbox/

{
  "type": "Note",
  "content": "hello",
  "to": ["https://example.org/@room35/"]
}

108 characters