Is Social Networking Sites All That?

I have recently posted a profile on three of the social networking sites . One of the reasons that I got on Face book, Twitter and My space, is the opportunity to interact with everybody that I have known in my life, is a very real possibility. I've only been on them a couple of weeks now and have found friends that I have not seen or heard from in 30 years. As I was searching for ways to better my presence on the sites I was looking for some help , this site seems to have a good grasp of how to do just that Social Marketing Journal