(Reuters) - Shares of gaming company Zynga Inc fell as much as 10 percent, a day after the "Farmville" creator reached an agreement with Facebook Inc that reduces its dependence on the social networking giant. The companies reported in regulatory filings on Thursday that they have reached an agreement to amend a 2010 deal that was widely seen as giving Zynga privileged status on the world's No.1 social network. ...

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