The Face of Facebook web app (http://app.thefacesoffacebook.com/) displays all entire Facebook users in one page using our own profile images, they display everyone in a total of 1.2 billions plus of Facebook users around the world. I tried using the app by connecting it to my account and after a few seconds I learned that I'm in the 25th million position.
Everything is arranged chronologically and not by the time frame when you first sign up with Facebook.
Try it...just for fun!
source
