A generation of teens lives more in the virtual world than the real one and adult anxiety is producing calls for a crackdown on social networking sites. But Facebook, Twitter, YouTube and Instagram are now the places where kids can do what kids always do: hang out with their peers. They may give up their privacy, submit to commercial exploitation and become vulnerable to cyber-bullying, but researchers say that's not the whole story. We hear from one who's embedded herself with teenagers and reports on how the world looks from their point of view.