mstdn.starnix.network is one of the many independent Mastodon servers you can use to participate in the fediverse.
Starnix is a Fediverse/ActivityPub Focused platform. Topics are mainly Technology and computer related but are not required to fall into those categories.
This literally led to major reforms for school bus design because the gasoline tank blew up and there were few exits on the old busses. It's why every bus is diesel now.