Well, Facebook's "app ecosystem" was dominated by Zynga. For a long time, Farmville was the top app and it was the only app that Facebook's highest engagement u

Well, Facebook's "app ecosystem" was dominated by Zynga. For a long time, Farmville was the top app and it was the only app that Facebook's highest engagement users interacted with. As such, when Zynga went downhill, it took the entire ecosystem with it.