What are the biggest negatives of using social network sites like Facebook etc?

[Senthil]

Privacy is I guess has been & is still a major issue on most Social Networking Websites. I recently came across http://www.amble.in which looks to offer good privacy features. You can interact differently with your friends, classmates, neighbors, office friends and so on.i.e. you don't have to MIX them all. I have also seen few other websites like tumblr.com that allows multiple profiles (amble.in also does) plus there are some personal networking sites. In reality there are a whole lot of social networking sites and it feels kind of dizzy when your are trying to pick one. I would say Privacy is the major Negative with most Social Networking Websites