You know how Apple has their own charger, their own messaging app, and some other stuff just so that they are different? Because fuck the rest of us, I guess? That's bluesky, relative to fedi space.
I'm on bluesky. It got most of the twitter people I followed for humor. The protocol supposedly allows (will allow?) other servers, but for now I think it's mostly the one. I prefer mastodon governance/structure, but bluesky has a bunch of people I want to read.
It's a python library for controlling experimental hardware and managing experiment data and metadata at large scale research facilities such as synchrotrons, free-electron lasers, and neutron sources. It's pretty great, but there's no need to sign up to anything.