Very interesting info Jenn! Was a big Facebook reader, posted from time to time... the last four months on Medium, I'm absent on FB! I don't miss it, but I'll always have it for family and friends far and away...some of the groups are pretty cool, and there's an awesome FB page that is just the best.
I've been lucky none of my sons like FB - so it's not been a worry for me! But I agree with you - parents are to be concerned about what their children post and see!
I truly wonder how this will all evolve.