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[–] 9000timesempty ago 

All digital cameras and phones put what's called called EXIF data in all photos. Everything from GPS coordinates, the make and model of the phone/camera to the color data on the photo. But is Facebook is adding a call home though? How can that work? Wouldn't something have to know that instruction before executing it? So the instruction is for Facebook apps then. I doubt tracing outside af a Facebook environment. Facebook would have to scour and keep track of all photos online. It's more a of a "tag" really, of who in facebooks's environment, is the original owner of the photo.