Bluesky seems to have hit a network effect threshhold in the wake of the election, and some of the last Twitter holdout communities have re-grouped over there this week. New celebs, more sports commentators, scientists, etc, and nearing 15M users.
Mastodon also seems to be picking up a bit, but not to the same extent. I think that's fine, I've been encouraging people at Bluesky to at least have an account over here.