resources of abc news, with cynthia mcfadden, terry moran, bill weir, and tonight, juju chang in new york city, this is nightline, june 10th, 2011. and good evening, i m juju chang. science fiction almost got it right. fats recognition technology has become part of daily life. but accept instead of controlling security access to top secret spy facilities, the technology is being used to identify the people in that crazy picture from last weekend s beach party. it s all happening, of course, on facebook, which has been quietly using the software on every photo you upload. and today, a privacy group filed a complaint against facebook. here s nick schifrin. reporter: facebook knows me. it knows my friends. it tracks what i like. where i live. and knows my sisters are kristy and laura. but now, facebook also knows, well, my face. of all its 500 million users, it can recognize my fashion, my face out of everyone else s. not just mine. if you re on facebook, facebook can reco