surely if they are dumbfuck enough to put it on his own facebook page then it can be tracked through his IP and MAC address back to his computer and even the cameraphone he used to take the photo??
Or are they now that brazen that they just dont give a fuck as they know the CPS wont bother in many such car theft cases incase some expensive lawyer claims that somebody else must have taken the photo, used his computer and known his facebook password