I ran some pictures through a celebrity look-a-like program, and here are the results for this photo:
Results below; bold is the one that was declared the best match by the program used. Others are just other matches that I found funny.
Nathan (bottom left)=Angelina Jolie, Billy Idol
Isaac (top left)=Leslie Caron, Shirley Temple
Me (bottom middle)=Kate Beckinsale, Quentin Tarantino, Billie Piper, Alyson Hannigan
Derek (top middle)=Matthew Lillard
Noah (top right)=Matt Stone
Karl (bottom right)=Billie Piper, Harry Houdini
I chose the names for the ones I found funny because of the fact that they were some of the few I knew, and/or I LOVED THEM! For those who are interested, full lists can be seen by clicking the link to read on.
This got me thinking; what do they use to compare?. After a couple of tests I figured it out. They scan the picture for places that look like they have two eyes, a nose, and a mouth. If you've got eyes, nose, lips, cheek bones, blah blah blah, in the same place as this photo they have, then BAM! You're a shoe-in! So, it's about the positioning of the face and camera. Huh.