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Game Changer: Inside Zynga’s 'Farmville' 

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Social gaming company Zynga is behind popular games like 'Farmville' and 'Words With Friends.'  NBC's Kate Snow got a behind-the-scenes look at how Zynga develops the games that have the world playing together.  Kate Snow’s full report airs Monday, Jan. 16, at 10pm/9c on Rock Center with Brian Williams.