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.

Server stats:

28
active users

Why doesn't Arxiv have proper feeds?
That way, one can read updates in specific subjects using their favourite feed reader.