I don't. When I briefly used Facebook, it seemed a little intrusive and tedious for my tastes. I'd rather not revisit the horrors of middle school, for instance, and I don't need to know every time Stacy "likes" a slice of pizza. Plus, it's kind of weird to interact with old college friends, coworkers, and distant relatives all in one place. If you want to keep in touch with me, and we can't hang out in person, email and Skype are better alternatives. Forums are nice, but I rarely use them for social networking, so I tend to be more private on those than I might otherwise be. Facebook, unfortunately, largely removes the privacy element from the internet experience as it mines our personal data for sale to advertisers and researchers. Even when you opt for the more secure settings. I don't care if they track my searches or whatever, but as soon as that information is personally identifiable with me, as line has been crossed. This isn't to say that other sites don't do such things, but for me Facebook has come to represent, in my mind at least, much of that's wrong with the current state of the web.