Bluesky has brand recognition (founded by the same dude as Twitter), more people and “feels like twitter”, in the sense of what you see, more than mastodon. Also, news outlets seem to be migrating there.
Mastodon (and pleroma, misskey, etc) is seen as a place for weirdos and techies, with “nothing interesting going on”. Several people mentioned this already one way or another, but that most servers/instances are “specific” about whatever means that people will feel that they might miss out on something by choosing the wrong server.
Worth getting into? Absolutely. It can be very cheap, too.
Where to start? That’s the trick question. It will depend on whether you start with console or PC, the latter having a much more extensive catalogue of games, plus emulation of older systems.
My personal recommendation is getting a PC, it doesn’t even need to be a gamer one, anything that isn’t a piece of shit and was released in the past 4 or so years will do good for playing low end games and emulate anything up to N64 and possibly Dreamcast games (2003 and earlier). You can use a variety of console controllers on computer, so it’s fine. Whe searching for ROMs, be sure to have uBlock Origin installed on your web browser.
If you have any friends, talk to them, see what they’re playing or would recommend you to play. If you don’t, download steam and download demos of games that look somewhat interesting to you. Check GOG as well, it tends to have some older PC games as well, plus demos and whatnot.
Try out a variety of genres. It’s possible one game of a certain genre might not “click” with you, but another might.