If your face and name are anywhere on the web, you may be recognised whenever you walk the streets-not just by cops but by any geek with a computer. That seems to be the conclusion from some new research on the limits of privacy.For suspected miscreants, and people chasing them, face-recognition technology is old hat. Brazil, preparing for the soccer World Cup in 2014, is already trying out pairs of glasses with mini-cameras attached; policemen wearing them could snap images of faces, easy to compare with databases of criminals. More authoritarian states love such methods: photos are taken at checkpoints, and images checked against recent participants in protests.
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