You do know, don't you, that the "teens are leaving FB" is the go-to space filler article for slow news days? One thing to remember about teens: they are liars because they want to look cool! Their mouths lie, but their usage and engagement stats speak truth, and the truth is good for FB: exploding number of users, exploding engagement--even among teens. And don't forget, FB is going after 3rd world via feature phones. When they start paving their roads and getting indoor plumbing, FB will OWN them.