It’s possible to run a browser from the Steam UI. As far as I recall it even works in parallel to a game. You could also run Signal or Discord and use that for voice calls while playing a game. It’s a bit clunky though, wouldn’t recommend it.

This. If you like to follow people (Twitter-style) then Mastodon is the right tool for you. If you are focused on topics and don’t care much who supplies the content (Reddit-style) then Lemmy is what you want.

Btw, It’s already possible to block all bot posts