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The road to 'Farmville' starts at Zynga

ONLINE EXCLUSIVE: Social gaming company Zynga is behind popular games like 'Farmville' and 'Words With Friends.'  NBC's Kate Snow traveled to the company's headquarters in San Francisco for a behind-the-scenes look at how Zynga develops games that more than 150 million people play every month. 

Watch Kate Snow's full profile of Zynga, and its founder Mark Pincus, 'Game Changer,' from Rock Center with Brian Williams.