There is no mass defection (from Facebook by teenagers) under way. Instead, teenagers are using
different social networks for different things, says Lee Rainie of the Pew Research Centre’s Internet and American Life project. They post less intimate stuff to Facebook and more risqué material to networks not yet gatecrashed by their parents. Mr Miller’s research has also highlighted this habit.
The danger for Facebook is that one of these newer places starts to attract parents.
Read more at The Economist