@schizanon I'm trying to explore what people do with ActivityPub that goes beyond microblogging. It seems it would be perfectly fine to have, say, "book" as a noun / ActivityPub object, to which AP activities could be applied. E.g. the vocabulary already defines a "read" activity. Bookwyrm could accept such activities from the outside, for example. (ignoring the "minor" question whether there are any apps that can generate that)
@J12t again, Lemmy (and #KBin) expose their subreddits as #ActivityPub Actors. using #Mastodon we can mention @lemmy and it (may) appear as a post in the subreddit.
There's tons of problems with how it works judging from the reaction I get from #Lemmy users when I use the feature.
The fact is that Mastodon provides a microbloging interface. using it to do non-microbloging things is always gonna be weird.