Facebook wants to save your face. Should you say yes to facial recognition?

The question of whether you should let Facebook save your face is gaining in urgency as Facebook makes moves to expand its deployment of facial recognition. It faces a lawsuit by Illinois residents over the technology. SAN FRANCISCO -- Of all the information Facebook collects about you, nothing is more personal than your face. With 2.2 billion users uploading hundreds of millions of photos a day, the giant social network has developed one of the single-largest databases of faces and -- with so many images to train its facial recognition software -- one of the most accurate. The question of whether you should let Facebook save your face is gaining in urgency as it moves to expand its deployment of facial recognition, rolling it out in Europe, where it was scrapped in 2012 over privacy concerns and scanning and identifying more people in photos. At the same time, the giant social network is attempting to quash efforts to restrict the use of facial recognitionin the U.S., from legislation to litigation.