According to the following site - Bluesky has ~19m users.
Increasing by ~8.0 users per second.
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I'll repeat something I said in another thread.
Post-election - Bluesky has become a lot less fun for me. The quality of posts and threads has gone downhill. A huge number of shitlibs, turbolibs, grifter libs, resistance libs, the most tedious rockstar libs, etc have come over from Twitter so it's like lib Twitter but far worse. It's a lib echo chamber due to Bluesky's nuclear block and the libs block super-fetish. Also there are LISTS of people they block which are shared. Libs are blocking leftists they never spoke to or even saw the display name of.