@ossobuco,
Actually - I'm not so pure in this. If the url gives where the photo comes from, I don't chase who the photographer was, thinking it can be chased from there if anyone wants to, but sometimes it can't. Well, I'll go further sometimes if I'm looking for info about the scene.
I'm remembering one or two posts recently on a2k where someone mentioned there is another way to find a photo source - but I forget what the way is.
Duh.