i will catch up on the discussion, but I am not sure, I can be helpful here... I am relatively new to the Groups idea and try to figure out how to support it as best as possible and to be as compatible as possible...

But it seems technically possible to use prefixes like ! or ~... https://swicg.github.io/activitypub-webfinger/#names

But Lemmy seems to anly add the ! only in their own UI. For WebFinger it only works without, so there is still the issue with name collisions.

@angus we already do that with the blog user. The question is, what if it is in severyl groups? do we have use a collection for the audience field? Or do we need to change the "audience" in relation to the Announce?

We are thinking about topics a lot lately, so I have some questions how the #threadiverse is handling/supportinh it atm. For WordPress we currently support one Group (topic) yet and that is the Blog-Author (@[email protected] for example), but we plan to have more Groups (topics) in the future, like for example Categories and Tags. Is that supported by nodeBB, Lemmy or Discourse? /cc @angus @devnull @nutomic