We hate to sound like a broken record, but social games like FarmVille and Mafia Wars are becoming increasingly prevalent on mobile devices like smartphones and tablets. Developers like Zynga have repeatedly stated their interest in mobile and believe that it's the next logical step for social gaming. But what if I told you that across the Pacific Ocean folks are already five years ahead of us? Papaya Mobile CEO Si Shen claims that Japanese and Chinese social game developers have been toying with location-based services in their mobile social games since 2005. And you know what, it's time the US catches up.