Mark Zuckerberg wrote Facemash the predecessor to Facebook, on October 28, 2003, while attending Harvard as a sophomore. According to the Harvard Crimson, the site was comparable to Hot, and "used photos compiled from the online facebooks of nine houses, placing two next to each other at a time and asking users to choose the 'hotter' person".
Facebook is a great way to meet friends and keep up on what they are doing. Once you add a friend to your Facebook friend list you will always know when they are adding things to their blog or updating their profile.