Fastr, Pussycat, Fastr

I just played Fastr, a game where you have to guess what a bunch of images pulled from Flickr have in common. I think. Not really sure how it works, actually. It's a competitive game — you play against a number of other people, and you get to see everyone's score, updated in real time. I'm guessing the rest of my opponents must have been as confused as I was about how to play, because somehow I won my round. Cool!