Plot: Pet Society was a social-network game developed by Playfish that could be played on Facebook. The game ranked as one of the most popular Facebook applications. Players could design their pets by choosing genders, names, colors and altering appearances. Wikipedia
Plot: FishVille is a defunct real-time aquarium simulation game developed by Zynga, it was available as an application on the social-networking website Facebook. The game allowed members of Facebook to manage virtual aquariums by rearing fish. As of October 2011, FishVille had 1.6 million monthly active...
Plot: Treasure Isle is a defunct browser-based video game by Zynga for Facebook, launched in April 2010. It allowed users to dig for treasure on various islands. The game was discontinued on December 5, 2012. Wikipedia
Plot: YoWorld is a browser-based virtual world game which was released on May 8, 2008. It is currently developed by Big Viking Games. The game operates on the freemium model, and is supported through microtransactions, as well as a voluntary in-game ad program. Wikipedia
Plot: Zombie Lane is a social network game developed by Digital Chocolate's Helsinki-based studio and released on Facebook and Google+ in 2011. In late 2011, it was released on the iOS App Store. Players must rebuild their shattered neighbourhoods after their destruction by a zombie apocalypse. Wikipedia
Plot: CityVille is a defunct casual social city-building game developed by Zynga, and released in December 2010. A sequel, CityVille 2, was released in December 2012. It was closed down on February, 2013 just three months after the game's release. CityVille was shut down on April 30, 2015. Wikipedia
Plot: Crazy Planets was a game created by Playfish on the Facebook platform. It was available for some time but then was disconnected from Facebook for revisions. It was never put back online. Wikipedia
Plot: Ravenwood Fair was a social network game on Facebook designed by John Romero and developed by Lolapps. Ravenwood Fair was launched on the Facebook platform October 19, 2010. The game closed down on July 18, 2013. Ravenwood Fair Remake seems to be coming. Wikipedia