The website “The Faces of Facebook” compiled the profile pictures of every user of Facebook, and ordered people chronologically from the day they joined. You can scroll in and out of the mosaic to find yourself, although the odds of correctly picking are 0.0000000083%. If you don't want to waste three-and-a-half years hunting, you can connect via Facebook and the site will pull up your exact location and that of your friends. It also shows you how early an adopter you were. I was the 1,679,185th user of Facebook. Can anyone beat that?
[H/T Laughing Squid]