Once Photo Synch is enabled, each and every image taken by a cell phone’s camera is automatically sent to Facebook’s servers and uploaded to a private album for that user to later log-in and review. Should the user then decide they want certain pictures to go public, a click of the mouse from their computer will allow for the image to be made viewable to a select circle of friends; if no action is taken, the image will remain reserved only for the person who owns the profile - and Facebook.
http://rt.com/usa/news/facebook-mobile-privacy-sync-187/