I HATE techno patents like this. They make no sense.
To me this looks like Facebook is trying another revenue stream out. Patent trolling is very profitable if you can get away with it.
I wonder where they will start.... by trying to "license" the patent to sites already doing this or will they go straight to court and try to extort money from people that way?
Imagine if someone patented "A digital photo gallery that displays user uploaded photos in a photo gallery styled view"