With Sony's Sodium for PlayStation 3 and Ohai's game City of Eternals on Facebook, social gaming could bring MMO to the masses. Sony has launched Sodium One , a new sci-fi MMO that is part of PlayStation Home, its virtual world for the PS3. The online game breaks new ground on the PS3--it's a sci-fi space world with a virtual economy and virtual goods, a series of casual mini-games, and "Salt ...