I would have deleted all people using facebook which puts me in a bind: If I don't use it, I cannot delete them over there.
So I thought ok just assume all people in the world use facebook and blocked everyone even in rl with some exceptions (like professors where I 100% know they don't use facebook and other elitists). I really like how Trumps campaign handled it when they blocked him from tweeting. I think in almost all cases of important persons they let some underpayed dude handle the facebook and twitter stuff just to appeal the people who hunt friends there lol.