King games have overtaken Zynga games on Facebook

"Zynga Inc.’s new chief executive officer, Don Mattrick, takes over the struggling social-gaming pioneer amid one of its biggest challenges yet: losing the No. 1 spot on Facebook Inc. to upstart King.com.
King, developer of “Candy Crush Saga,” yesterday reached 150.4 million monthly users on Facebook Inc. -- surpassing “FarmVille” maker Zynga, which has 150.2 million, according to online tracker AppData. That ended Zynga’s five-year reign as the top game maker on Facebook’s social network."

Source:  Washington Post, 2nd July 2013