Support receiving of private postings without the "followers" collection
Pleroma currently seems to behave like Mastodon. The following lines are a copy from this Mastodon issue: https://github.com/tootsuite/mastodon/issues/8752
Currently Pleroma accept two kinds of private postings via AP:
- Private postings to the "followers" collection
- Private postings where people are tagged
The ActivityPub specification however does know other ways. For example one can create a post with several people added in "to" and/or "cc" - but without tagging them or adding the "followers" collection.
I know that it is a design decision not to allow those postings to be created from the Mastodon UI. But other systems allow this, so Mastodon should accept and display them.
They should be displayed in the regular timeline (like private postings to the "followers" collection). Upon answering such a post, the system has fetch "to" and "cc" from the original post, so that the receivers would stay the same. However, this can be done completely in the background and needn't to be displayed in any way in the UI.