The fact that Zynga was being treated as a proxy for Facebook is compelling evidence for just how closely the fates of these two companies are linked. Zynga would absolutely love to see itself as being a cross-platform company, with fingers in every pie going - but right now, that's simply not the case. In social networking terms, there's only one pie with any meat in it, and that's Facebook - Google's Plus offering simply hasn't gained any traction as a social network (although it's got an interesting set of content-sharing communities growing up around it), while Twitter isn't a games platform. In mobile terms, Zynga's still far behind the pack and struggling to make mobile work for it. It's wedded to Facebook, whether it likes it or not. Facebook, for its own part, is equally wedded to Zynga.