Facebook is launching "Sponsored Stories" ads that feature users' organic interactions with brands, like check-ins or page likes, in order to leverage the social context and recommendations from friends. This utilizes earned, owned, and paid media together. For brands, it means their message is out of their control but could reach more people. Users may feel their privacy is invaded but could also discover new brands from friends' recommendations. Marketers should test Sponsored Stories carefully and continue engaging fans authentically.