Behind Groupon's $6 Billion Brushoff

If you believe the rumored numbers, it would have been the biggest acquisition in Internet history--and you definitely should believe the numbers. In the fall of 2010, search giant Google offered nearly $6 billion to buy Groupon, the daily-deals site that became the quickest firm to rack up $1 billion in sales and the second-quickest, behind video behemoth YouTube, to hit a $1 billion valuation.

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