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RockYou was a company that developed widgets for MySpace and implemented applications for various social networks and Facebook. Since 2014, it has engaged primarily in the purchases of rights to classic video games; it incorporates in-game ads and re-distributes the games.

Based in San Francisco, California, RockYou was founded in 2005 by Lance Tokuda and Jia Shen. The company's first product, a slide show service, was designed to work as an application widget. Later applications included various forms of voice mail, text and photo stylization, and games. As of December 2007 it was the most successful widget maker for the Facebook platform in terms of total installations.

In May, 2007, RockYou was one of the companies invited to participate in F8, the event at which Facebook announced an open platform allowing third parties to develop and operate their own software applications on the Facebook website. Applications made for Facebook include Super Wall, "Hug Me", Likeness, Vampires, Slideshows, Birthdays, MyGifts, and Emote, among others.