Revenues from Zynga games accounted for 12 percent of Facebook’s 2011 revenues, the social network’s S-1 filing reveals. No other customer represented more than 10 percent of total revenue in 2009 or 2010. Facebook reports that social game devs — most of all Zynga — are currently responsible for almost all revenue derived from Payments.
Aside from in-game transactions conducted with Facebook Credits — of which Facebook gets up to a 30 percent cut as part of a special agreement with the social game giant — and ads bought by Zynga, the CityVille developer also generates a large chunk of pages where Facebook displays ads. While Zynga is locked into Facebook Credits until May 2015, Facebook points out that any trouble in paradise with its biggest game developer could harm its bottom line.