Announce Activity

ActivityPub
7

Well, as I said before, an Announce is an Announce. By which I mean, when you send an Announce, that is semantically a “reshare” of the original object. Your Announce activity gets added to the shares collection on that object.

If you would like to reshare something with an additional comment, then your options are:

Announce Note, but include additional content on the Announce.

In this case, most fedi projects don’t understand content on Announce, so your activity will “fall back” to just being a boost/retweet/etc of the original object/post. Your comment won’t be visible anywhere in those projects.

id: <some-reshare>
actor: <you>
type: Announce
content: "This is my comment"  # most projects will ignore this
object:
  id: <some-post>
  attributedTo: <someone>
  content: "Original post"

Create Note as usual, but insert a link and then tag that Link with extra metadata.

In this case, most fedi projects understand a Create Note to mean posting a status. This will “fall back” to being a status with a link effectively copypasted in. As a progressive enhancement, some projects like Foundkey will understand “object links” (a la FEP-e232) and open those links in-app rather than in a new browser tab. Additionally, if you use the right link relation, the link can be understood as a “quote post” according to Misskey semantics, and Foundkey will embed a preview of the linked post when rendering your own post.

id: <some-create>
actor: <you>
type: Create
object:
  id: <your-post>
  attributedTo: <you>
  content: "This is my comment. RE: <quoted-post>"
  tag:
    - href: <quoted-post>
      # per FEP-e232, we hint that this link can be fetched as an activitypub object
      mediaType: application/ld+json; profile="https://www.w3.org/ns/activitystreams"
      # for Foundkey, we hint that this is a "quote" as understood by Misskey
      rel: ["https://misskey-hub.net/ns#_misskey_quote"]

See FEP-e232: Object Links - #34 by trwnh for more

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