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"The Facebook platform game FarmVille now supports the Facebook Credits virtual currency.\nThe popular online game uses two units of in-game currency: Farm Cash and Farm Coins. Previously, you could buy them with a credit card or PayPal. Now the game offers Facebook Credits as an option.\nFacebook Credits are the number-one option, actually. They're the default payment choice, featured at the top of the list pictured here.\n\n\n\n\nWe recently learned that Facebook takes 30% of developers' Facebook Credits revenue \u2014 the same percentage that Apple takes from its iPhone and iPod touch App Store sales. Analysts have speculated that Facebook might surpass $1 billion in revenue this year, and the social network's virtual currency could be a vital part of growth beyond that.\nThis new option in FarmVille is arguably bigger for Facebook Credits than it is for the game. FarmVille has more than 80 million users, making it bigger than Twitter. Exposure to an audience that large is an important milestone for the Facebook Credits project, which has been a slowly expanding experiment up until now."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2010/03/10/farmville-facebook-credits/>