I quit Facebook years ago, and just recently created new account. It really helps, I need eyes on me, to get some opportunities. I need to be visible.
I am controlling is my behavior, treat fb.com as a real public life, and it's hard for me, I used internet as free place where I can be my true self as oppose to real life where other people might disagree, where it is better to always avoid politics and religion to maximize social gain.