If I had Facebook, I would do the things I do here on Facebook.
No, you probably wouldn't. There are social constraints and such that would probably hold you back from, say, telling some chick you know IRL "hey babe I heard you're a nigger lover" on FB, or "bro I accidentally ran over your cat/dog/little brother this morning, sorry" to a bro of yours. I mean in this day and age that's pretty much the least that will get a fanciful reaction out of anyone without just making you seem like a douche/prick/asshat.
So yeah FB is not the best trolling mechanism. Not that it is never used for that purpose, but pretty rarely actually.