San Francisco -- John Schappert has resigned as the COO of San Francisco-based social games developer Zynga, the company announced in a regulatory filing. Zynga, which said that Schappert "leaves as a friend of the company," has not yet named a successor. The move comes less than a month after Zynga -- the publisher of such popular titles as FarmVille and Words With Friends -- shook up its management structure following poor second-quarter results, removing some of Schappert's responsibilities in the area of game development. Zynga had hired Schappert away from rival Electronic Arts early last year.
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