I haven't used Facebook since 2008.
And I only used it on and off for +/- 3 months.
TBH, I guess people like being interconnected etc.
But I just didn't like Facebook .-. Something about it always irked me.
And then the whole "Hey let's sell Facebook shares 4 mony" especially deterred me from ever returning, not to mention the scenario you already explained wherein someone uploads your face with a magic marker penis on your forehead and it goes viral.