Mastodon - my main social feed platform that first introduced me to the Fediverse in general.
Lemmy - my second main social feed platform that originally substituted Reddit from years ago.
Matrix protocol - communication platform I use to connect with users on the Lemmy instance I'm on
Peertube - would love to get an account going and use it more often but still don't know how but there's FediVideo.
Bookwyrm - Goodreads alternative that I signed up for that could use more work for a genuine reading tracker.
BONUS: my least favorite Fediverse platform lately
WordPress - because I used to run art blogs on there before I heard word about drama about the CEO of the corporation so I basically had to put out my last existing art blog...RIP.
What's interesting is that currently, the site is broken, but in the footer you can see the last set of magazines that were new.
Which means the database is still intact, and if not a full resurrection, we could get our data back at least (I lost a lot of content when kbin.social went down). Just gotta figure out who to contact - which company is actually maintaining or hosting the servers that kbin.social run on..