I have set up with my current @alevyinroc name on the techhub.social Mastodon instance as a replacement, and I know a number of #sqlfamily folks are moving there and to there federated Mastodon servers. I’m still figuring out some of this Mastodon stuff. Chrissy LeMaire has compiled a good list of tips and starters if you need some help.
I’m also on counter.social as @alevyinroc but that platform seems very flaky, the mobile app isn’t great, and I can’t link direct to my profile as I don’t have a Pro account.