Starting this monday, I'm going to work for about 5 months on the ActivityPub module for Drupal: multi-user support, an API allowing you to use any (mobile) client, a new front-end and Drupal recipes, it will rock! Thank you @NLnet!
NLnet, @[email protected]

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Allow any entity to be actor

Problem/Motivation As explained in #3272173 . But focusing on first scenario: >> ... Create a Group (as in multiple users who are members of a Group defined by the Group module) controlled activitypub group type actor. Proposed resolution Be more generic when picking entity for an actor. Replace user by generic entity (but preserving all the existing and working code for user -> person case) Let other modules to implement their own kind of actors. New route proposal.

Drupal.org
That's part of a different grant which was awarded last year, but I haven't heard anything about it. There's a chance thoug that part might come to me, but I'll know more about that in a couple of weeks!