After receiving number of invitations and IMs for joining FaceBook, finally I joined FaceBook!!! another social network like Orkut but with little better privacy. Click here to see my profile on FaceBook.
Beside entertainment or communication (for someone might both), I found Facebook is very good implementation of Web 2.0 ... allowing users to change look and feel as he/she likes. You will also fine the idea of Composite Application in action. Super Wall, Fun Wall, Honesty Box and etc are applications that integrated with your profile or facebook... now I am considering FaceBook as testing application of Web 2.0 and might will use it as prototype for my own Web 2.0 application.