even before the social network came out, facebook was the most used social networking site. after jesse eisenberg and andrew garfield's portrayals of mark zuckerberg and eduardo saverin though, the site's popularity has gone through the roof. from photos to statuses to even videos and notes, facebook is the one place you can express yourself best. and also, it lets you keep tabs on that cute girl you met or that boy who broke your heart last week. what more could you want?