If someone uploads a photo of your face to Facebook, the company usually knows that it's you thanks to facial recognition technology. Now Facebook won't just know it's you -- it'll tell you about the photo, too. From a report: Facebook is expanding its use of facial recognition technology and will now alert people that a friend, or a friend of a friend, uploaded a photo of them, even if they haven't been tagged in the picture. If anyone uploads a profile picture that includes your face, Facebook will alert you of that, too. "We're doing this to prevent people from impersonating others on Facebook," the company wrote on its blog Tuesday. 查看全文>>