Zynga, the world’s leading developer of fun and social games, is now the top application developer on Facebook according to AllFacebook and AppData. Zynga is the leader with 40,335,309 monthly active users on AllFacebook and 40,009,796 monthly active users on AppData followed by RockYou with 39,714,907 users on both sites.

Zynga continues to extend its leadership position as the #1 Facebook app developer and the #1 social game developer across all platforms. Zynga develops social games for a variety of platforms including Facebook, MySpace, Bebo, Tagged and most recently the iPhone. With recent successes on the iPhone such as “Mafia Wars” and “Scramble,” Zynga is showing its ability to bring its games to new audiences.

“Our mission is to make the most fun and social games on the planet, and it’s great to see that the numbers are with us,” said Mark Pincus, CEO, Zynga.