Findface

".... FindFace, which launched two months ago, lets users take a photo of a crowd and work out individuals' identities with 70 percent reliability. It does this by using image recognition technology to compare faces against profile pictures on Vkontakte, a Facebook-style social media site that has 200 million users.

The app already boasts 500,000 users and has performed nearly 3 million searches. Though currently limited to Russia, the app’s creators, Artem Kukharenko and Alexander Kabakov, imagine a world where the app is used by everyone to examine strangers’ social network profiles just by taking a photo of them on the street...."

http://www.techspot.com/news/64857-nightmare-russian-facial-recognition-app-one-step-closer.html