“The F.B.I. is developing what it calls its ‘next generation identification’ project to combine its automated fingerprint identification system with facial imagery and other biometric data. The State Department has what several outside experts say could be the largest facial imagery database in the federal government, storing hundreds of millions of photographs of American passport holders and foreign visa applicants. And the Department of Homeland Security is funding pilot projects at police departments around the country to match suspects against faces in a crowd. The N.S.A., though, is unique in its ability to match images with huge troves of private communications.”
http://www.nytimes.com/2014/06/01/us/nsa-collecting-millions-of-faces-from-web-images.html?_r=1