I confess that I am a facebook addict. I check facebook about 2-3 times a day. Not only do I check my own profile, but I also check those of other people's and read the Newsfeed. Yes, I am a stalker. So be it.
At the same time, I don't think facebook is evil and I don't think the world is worse off because of facebook. In fact, I think the world's better off because of it. Pretty soon, they'll come up with something that launches off of Facebook. Just like how Omar said about chat rooms evolving into IM applications. But I do think it'll have to be something really crazy. Think about it, what else is there for people to come up with? We already have MSN/AOL to chat with our friends, we have emails (gmail, hotmail, yahoo mail, etc.), and we have facebook/my space/hi5/orkut to help us keep in touch with people and see their "pages." We also have blogs, search engines (Google), and a massive number of websites out there. So I really don't know what else we need. I'm happy with what's out there already.