Appear in a photo taken at a protest march, a gay bar, or an abortion
clinic, and your friends might recognize you. But a machine probably
won't — at least for now. Unless a computer has been tasked to look for
you, has trained on dozens of photos of your face, and has high-quality
images to examine, your anonymity is safe. Nor is it yet possible for a
computer to scour the Internet and find you in random, uncaptioned
photos. But within the walled garden of Facebook, which contains by far
the largest collection of personal photographs in the world, the technology for doing all that is beginning to blossom.
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