I suppose Mark Cuban thinks Facebook is going to turn into a 1991 AOL: a one-stop shop for all things internet, a lens through which you experience everything. This is the same Mark Cuban who said that Twitter will replace Google for searching... I think he's a little out of touch with how people use these services.

Facebook is attempting to expand in scope because they're ambitious, but at the end of the day, they're just a social networking site. As a matter of fact, they're really just a template for people who don't want to go to the trouble of designing their own webpage. Which is a great service, but that's all it is. Oh, and it's easy to link to other people's web pages.

Facebook and social networking are exciting today the same way EBay was in 2000: the medium is the message. You went to EBay because it was novel and fun. Soon enough, Facebook will have reached it's potential the way EBay has.