Angry Birds Friends is a puzzle video game and the sixth game in the Angry Birds video game series. It is developed and published by Rovio Entertainment. The game was originally an exclusive Facebook game called Angry Birds Facebook that was released on February 13, 2012, and was renamed to the current name on May 23, 2012. The Facebook version introduced power-ups to the Angry Birds game series. Android and iOS versions were released on May 2, 2013. Source: Wikipedia, "Angry Birds Friends", available under the CC-BY-SA License.