There are really two hypotheses: 1) _Teenagers in general_ do not use Facebook (which does _not_ rule out that they will become avid Facebook users once they g

There are really two hypotheses: 1) _Teenagers in general_ do not use Facebook (which does _not_ rule out that they will become avid Facebook users once they grow out of their teenage years) 2) _Today's teenagers_ disinterest in Facebook is fundamentally different than it was for teenagers' of several years ago (which would suggest they'll never get attached to Facebook the way previous teenagers once did, and therefore never become avid Facebook users). The 10-K report suggests #2 ("younger users were less engaged with the social network than previously") but my hunch is that it's more like #1 (I argued this here: http://whoo.ps/2013/03/04/teens-go-where-identity-isnt http://whoo.ps/2013/03/04/teens-go-where-identity-isnt). Teenagers now have more social networking options (Instagram, Snapchat, etc.) to choose from than previous generations of teenagers - which explains why today's teenagers are less engaged with Facebook than previously - but that doesn't mean they won't want/need the kind of canonical identity that Facebook provides (once that awkward, impressionable teenager actually grows into an adult with a firmer identify).