I agree with almost everything the author of this article has to say. He is able to write those thoughts a lot more eloquently than I ever could.
The Viral Me: Devin Friedman Investigates the New World of Social Networking: Big Issues: GQ
Rahul isn't worried about people knowing who he is; he's worried about not enough people knowing who he is. I had this idea when I was in the midst of my ill-fated share-athon the previous month: Maybe the social layer could be a kind of mass experiment in the liberating nature of extreme truth. We'd all be exposed as needy, nostalgic, compassionate self-Googlers. But to people like Rahul, an open society isn't one where people have access to the real you. It is simply providing access to the identity you very carefully construct for human consumption."