That Flickr started out as a massively multiplayer game called "Game Neverending"? I remember signing up for (and not getting into) the GNE public beta in 2003... I was just recently wondering what had happened to GNE (I assumed it had turned into Second Life), and googled around to find out that I was, in fact, a GNE player!
Look in the URL bar at the top of your browser. See the .gne file extension? Legacy stuff from the game engine that Flickr evolved from.