Zynga shares soar on Facebook connection

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(Reuters) - Zynga shares jumped as much as 22 percent on Thursday in the first trading session after Facebook revealed it made 12 percent of its revenue last year from the video game publisher. On Wednesday, Facebook listed Zynga, the maker of the "FarmVille" and "Words with Friends" games, as a risk factor in its filing for an initial public offering. It said that Facebook's results could be hurt if Zynga moved its games to other platforms or if the relationship deteriorated. ...