According to reports, social gaming company\xa0Zynga\xa0is now valued at more than seven billion dollars.\xa0 Is the company behind the virtual hit FarmVille worth really worth that much?\xa0 JPMorgan Chase is planning to start a fund for social media companies.\xa0 Is this\xa0a savvy investment or just the latest sign of\xa0a tech bubble?\xa0 Facebook's valuation is roughly the same as Disney's.\xa0 Which company would you rather own in five years?\xa0
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