Those of us who have been following the social gaming industry already know that Zynga has made up a big portion of Facebook's revenues. But lots of public investors only seem to have gotten the memo on Wednesday evening, when Facebook's S-1 filing revealed that the developer made up 12% of its total revenues, or $445 million. In the two days since, Zynga's stock has gone up more than 26%, to close at $13.39 this evening.


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