Said game is Cow Clicker, by video game designer and critic Ian Bogost. It's genius. As decribed by Mr. Bogost:
"You get a cow. You can click on it. In six hours, you can click it again. Clicking earns you clicks. You can buy custom "premium" cows through micropayments (the Cow Clicker currency is called "mooney"), and you can buy your way out of the time delay by spending it. You can publish feed stories about clicking your cow, and you can click friends' cow clicks in their feed stories."If you're on Facebook, you owe it to yourself to check it out. And if you're looking for something to do in those six hours between clicks, you might find this post by Mr. Bogost rather intriguing.