Zynga, the Company Behind Farmville, Is Apparently Worth As Much as $20 Billion

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The IPO registration filed today puts the number at $1 billion, though its valuation could eventually climb even higher, to $20 billion, by the time of the actual IPO.
Someone, and probably not your Facebook friends who play Farmville all day, is getting very rich off all that digital plot-tending — like modern-day serfdom!

This post has been updated for accuracy. [DealBook/NYT]