Farmville reached 65 million users in November, so something major is happening. Video games continue to reach a broader audience and be available in more places.
… but social games do seem to have gelled into some distinct genres. From Virtual Shackles:
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My name is Jesper Juul, and I am a Ludologist [researcher of the design, meaning, culture, and politics of games]. This is my blog on game research and other important things.