LinkedIn is pretty good, for finding work. I’ve gotten a lot of offers there. Ultimately never took any of them, ironically, but worth the time to set up a good profile.
If you’re thinking of joining Facebook… Don’t. It’s not worth it. Tell people you have something else and give them that info. Like your phone number or your email or your WhatsApp/telegram/whatever.
I hate how I have Facebook and am so dependent on it. I wish I could tell people I don’t have it.