Facebooks is rolling out a new feature for its photo tagging mechanism, it now looks for users in photos theyre not tagged in. The feature aims to detect if others might be attempting to use your image as their profile picture. The updates to the photo tagging system will not roll out in Canada and the EU due to local user privacy laws. Users can disable photo tagging notifications if he wont receive notifications when others upload photos of the user, then it will send them a notification.”]
Source: http://securityaffairs.co/wordpress/67077/digital-id/facebook-photo-tagging.html