Coca-Cola wants you to know that Coke Zero is a lot like Coca-Cola Classic. It believes this so strongly that it's willing to do something unusual to drive the point home, like introducing you to your own doppelganger.

Enter the Facial Profiler. The Profiler is a new Facebook application that lets members upload photos of themselves and match them with a similar-looking Facial Profiler user. The idea is that you can find your mirror image, just the way Coke has found its reflection in Coke Zero.

The...