200M Facebooks

In my quest to understand social networking I joined Facebook some days ago. Earlier this week they announced that they just passed the 200 million user mark. Sadly, it was not me. Until now I am somewhat underwhelmed by the Facebook service. I found a lot of people I know, but I am uncertain where to go from here with Facebook. I added my Blogger blog to my "wall" for the friends to see. But now, whats next?