I for one welcome Bluesky, the ATmosphere, BTS ARMY, and millions of Brazilians to the fediverses! (UPDATED)

An updated version, with a bit more about how Bluesky has addressed some of the problems that the 2022 Twitter influx to Mastodon ran into.

It's a very long post, but a lot of it is a detailed discussion of terminology in the appendix -- no need to read that unless you're into definitional struggles.