GameHouse–the casual gaming arm of RealNetworks that’s been around under one name or another for a decade–is trying to respond in a big way to the rise of social games, virtual gifts, the Facebook platform, and other trends reflected in wildly popular games such as FarmVille. At the Web 2.0 Expo in San Francisco, it’s launching a platform of its own it calls GameHouse Fusion–a set of services designed to help game developers bake social features into their products. They include everything from simple social stuff like leaderboards to special trophies gamers can create themselves; virtual goods; hosting and ad-sales services; and more. And they’re designed for browser-based games (including ones built for both the Facebook and OpenSocial platforms), downloadable ones, and ones for the iPhone and other mobile phones.