I notice my teenage sister using Facebook as something like an appliance: like email or SMS...it's just a little tool. When I was in highschool, it was a platform; a destination.

With un-monitized mobile apps and notifications on every device, it's just a communication tool nowadays. Instagram and Pinterest are what I notice teens using the same way I used Facebook in highschool.

So my predicion: it either becomes like Google and Email...or it dies. But nothing can bring back its coolness factor.