I don’t go there often. A guy in our company was just let go yesterday for a post on his facebook about his boss. HE DIDN’T POST IT - but it was there to be seen by the wrong person.
Potential employers AND employers ARE looking if they can!
If they can. I keep my facebook closed to anyone who is not a friend and some things are closed to professional colleagues. (yes, you can close items off by groups or people. like that feature_ Mostly because everyone else is someone I have either met or have potential to meet.