This is actually not that surprising, but still upsetting. I believe Facebook actually now claims the right to use your photos for their own promotional purposes. Flickr’s API allows others to display photos without attribution, even if your license, set via Flickr, requires such attribution. It’s really a mess.
I just resign myself to the fact that if I put a photo online, it’s a free for all and I consider myself lucky when people to attribute my work to me. Sigh.