Back when...
Back when I actually bothered with facebook and such.. I had two accounts... One for 'public'.. and one for private. I don't think I've used either one in a few months to a year, because of the simple social idiocy that goes on with them.
If a company wants to know about me, they can try to look at my facebook, they'd do better to look at my linkedin.. But best, they can just ASK me about myself. That's what the interview is for. Any company asking me for my social media login and password would get most of the papers thrown back in their face.
Sadly, this is the state of corporations and HR today. in the crapper.