@TylerAbeoJordan Yes, whatever I already mentioned a couple times before over the span of 3 days: set up private communities on the darknet, XMPP, IRC, Mumble, BBS, PGP encrypted emails, and/or Newsgroups.

If it really needs to be Twitter-style and Fediverse, there's still Diaspora that can be utilized, which is almost entirely separate from ActivityPub.