So... just found out about this today...
Apparently to promote the new Internet Explorer 9, Namco have decided to make a huge user-defined-and-created game of Pac-man.
You have to be on Facebook to create levels, but to play is free. When you go through a level exit, instead of (as normally) coming out the opposite side, you go onto someone else's user created level to continue the Pac-madness, depending on whether the exit was up, down, left or right.
I think it's an interesting idea in theory, but I do see problems of enlarged phallic-oriented levels being proliferated throughout the game. Anyway, linkage...
World's Biggest Pacman