People take pictures of you, post them on the web, and you probably don't even realize it. It's kind of a pain to tag photos on Facebook, especially with large albums.
With their simple Facebook app, Face.com does it for you:
And it's pretty accurate too. I only find a few minor mistakes:
Granted, Matt Mullenweg, Matt Cutts, and Tim Moynihan do kinda look similar.
Face.com also has a photo finder app that scans your friends Facebook albums and looks for photos of you that haven't been tagged yet. I do wish there was a button that allowed you to auto-accept all tags of you. It didn't mistake my face once when I tried it:
Since launching, Face has scanned over 1 billion photos and recognized over 400 million faces.
Click here for an invite to Face.com (first 50 will get in).