I've been loosely tracking several social platforms and protocols that are either in #development or are out there and people have migrated to from the #birdsite:
* #Mastodon
* #Post.news
* #Hive
* #Nostr (now funded by ex-tweep )
* #T2.Social (ex-tweep)
* #Spill-app.com (ex-#tweep)
* #Spoutible
* #Bluesky
Right now, Mastodon is the only one that fits as a daily driver for me, mainly due to network effects -- nearly everyone I know came here, and there are so many interesting people & posts.