MobileGirl hits the nail on the head: "The point here is that the technology is changing the meaning of the artifact".

The thing your phone records is called a photo, and the thing your film camera records is called a photo, but that doesn't mean you should directly compare the two - they're using for very different things.

On top of this I'd expect there to be some change in how photos are used in a mobile context, particularly as network effects kick in...