According to Facebook Q2 2013 report, it has 699 million active daily users. Natalia Rojas a freelance designer has created The Faces of Facebook project. This project visualizes over 1.2 billion Facebook users on one page.

The initial image is too fuzzy to make any sense. However as you zoom in on the image, you get the images of users who are arranged by chronological order based on when they registered on the social network.
Now, let the debates begin on the security aspect of Facebook