OpenFeint

http://en.wikipedia.org/wiki/OpenFeint

http://www.courthousenews.com/2011/06/24/37674.htm

https://play.google.com/store/apps/details?id=tr.com.obss.mobile.android.okey

http://venturebeat.com/2010/09/15/aurora-feint-launches-its-platform-to-socialize-android-games/

http://en.wikipedia.org/wiki/GREE