On our product pages we like most have facebook "like" buttons. It's worked great for a couple of years now... visitor clicks like and it posts to their FB page.
Facebook would take the link and when you clicked on it on a persons page it passed through their own php parser page and then would redirect them to our site without the garbage.
Now i'm noticing that there's a bunch of their extra information being passed to our pages. We have our pages set up to 404 any link that has extra stuff to combat confusion with google and to stop some of the spam links we were getting. Seriously we were getting some with querystrings that were pornographic from international locations What Facebook "like" links look like now is something like this:
This is really fouling things up.