Social games have transformed Facebook from an advertising-oriented business to a virtual goods powerhouse. Today, the majority of social game revenue is generated on Facebook, but Facebook makes up only about 30% of social networking traffic. The next wave of growth in social games will come from beyond Facebook, and social games will change the way we think about the social networking business. My guest post on Mashable, Why Games Are the Killer App for Social Networks, discusses how social networks can take advantage of this explosive opportunity.