Alright kiddos, lets get this out of the way: do not be fooled into thinking that just because a piece of work, like a picture, is put in the public arena that it is fair game and without merit of a copyright. Since January 1, 1978 when you produce something (like a photo) it is under automatic copyright protection. Also on his side: he can register a copyright with the gov't, as extra proof of ownership, up to 5 years after the publication of his images (say, on facebook), so he can fight someone in court. As a matter of fact, if he registers the images within the first 3 months of putting the images out there, the image snatcher can be made to pay the attorney fees of the plaintiff.
Sorry guys... Baez has a legitimate gripe in this fight...
http://www.copyright.gov/circs/circ1.pdf