Hubzilla and Friendica both cover a lot of features…but then you mentioned “usable.” Their UIs are so bad I want to eat my hand.
I still love the concept of G+ with circles, collections, groups, email options, and even web search authority. Too bad it was not open source.
I’m really curious how if nostr and fedi will continue to merge (thanks Alex) or if one will prevail making the other obsolete. He’s vegan, btw.