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Pretty good for 50k users (and keep in mind almost half a million downloads that can be converted into users)

50K posting users. I have an account but didn't post anything, like most people on any social media are lurkers.

No, as of a couple days ago, Bluesky said they had about 50K total users.

They have around 60k registrations, they've stated that in the last 48 hours or so