Facebook, it used be good 10 plus years ago for family and friends and having a laugh and being social in the real sense of the word, it's just tracking ads all over now with hardly any posts from my friends and family apart from birthdays that FB has to remind you of lol,
I don't know about Bluesky, i've never used it, so i cannot choose it, but from what i have read or heard it's an agenda and an activist site and people complaining about everything, i have no interest in that. i still use X now and again, but mostly Youtube now.