Social media may be hailed as the savior of sagging sales these days, but few have figured out what social media are, much less how to wield them. Even fewer realize that games are the first, and arguably the most viable and sustainable, social medium in the mix. Unlike newcomers MySpace, Facebook, LinkedIn and — gasp — even Twitter, the gaming communities are solid and stable, the camaraderie real and rooted deep, and the cash flow is, well, flowing.