Is there some documentation / specification for the ActivityPub part of it? I’d like to see how these messages, channels and groups get exchanged from a programmer’s / protocol perspective.

Edit: And for god’s sake cm0002, stop creating new accounts on a daily basis, I can’t block you as fast as you create new ones and shove around content which I never get any answers to. I’m not subscribed to a lot of lemmy.ml communities so I don’t see whether this is just a cross-post. Or credit your sources. Any of that would be fine. For reference: This content is taken from here.