FarmVille is a real-time farm simulation game developed by Zynga, available as an application on the social-networking website Facebook and as an App on the Apple iPhone. The game allows members of Facebook to manage a virtual farm by planting, growing and harvesting virtual crops and trees, and raising livestock. Since its launch in June 2009, FarmVille has become the most popular game application on Facebook, with over 82.4 million active users and over 23.9 million Facebook application fans in May 2010. The total FarmVille users are over 20% of the users of Facebook. Despite this, Farmville is still classed by Zynga as being in Beta testing stage, with "all of [their] players ... currently considered Testers." They state that, "Things will go wrong. Bugs will occur." FarmVille started as a clone of the popular Farm Town on Facebook. On February 4, 2010, Microsoft's MSN Games has also launched FarmVille on its website, requiring a Facebook account but not a Windows Live ID in order to play the game. On June 7, 2010, at Apple's WWDC, the CEO of Zynga announced that they were porting FarmVille for the Flash-less iOS platform. It was later released on 23 June 2010 for the iPhone, iPod Touch and iPad.