Social Networking

I have a doubt. How many of us who use social networking sites like Facebook or Orkut actually use it as a medium for social networking?

We tend to add people as our friends - people from school, long lost classmates, seniors, juniors, people from work, your neighbours. But how many of us actually use it as a social networking tool? We mostly use it as a place to declare to the world what we are upto at the moment (In the supermarket buying fish for dinner) or uploading snaps of your pets and so on.

I know I have people I have not talked to in years, and do not want to either, in my list. Maybe I shouldn't be on a social networking site. And neither should 90% of the people there.