I believe the reason is freedom of choice. Clearly not everyone wants to be part of this system. Do you not know of people who lock their profiles on facebook,

I believe the reason is freedom of choice. Clearly not everyone wants to be part of this system. Do you not know of people who lock their profiles on facebook, or people who strictly avoid social networking sites in the first place? If that is the case, I would be very surprised. Do we remove their ability to choose?