I was never a big user of Twitter, but I joined a Mastodon server around 2020. I am still using it regularly, but I honestly find it pretty hard to get useful content: it feels like either it's random stuff I don't care about, or always the same people I follow and don't bring me much.

At first I didn't want to try Bluesky (because of some of the founders, I suppose? I don't know, Mastodon seemed more organic), but I eventually did. And I actually like their system of "custom" algos. I have a few very interesting feeds now (international news, national news, ...).

So yeah, positively surprised by Bluesky.