Hey, I am currently trying to understand a bit better what the Activity Pub allows and what it doesn’t as I am preparing a presentation on that topic.
On Lemmy I can join other servers without having to recreate an account. Does that also work for across Activity Pub supporting software? Could I join a PeerTube page and then post there? Could I upload videos? Could I join Mastodon or Pixelfed and post images?
Images and videos on Activity Pub are sent as direct links to the host.
So you can send text comments from Lemmy to peertube that will be replicated, and watch the video by “following” direct links to the host (it is done automagically in your browser or app).
This explanation on how images and videos are embedded while text messages are copied is really helpful!