Groupon filing for IPO = a real tech bubble?

Coupon website Groupon Inc. filed Thursday to go public, looking to raise up to $750 million. The two-and-a-half-year-old Chicago-based company turned down a $6 billion takeover offer from Google Inc. last year and instead sought to pursue a public offering. After the craze of LinkedIn’s IPO, Groupon’s IPO is deemed to be another sign for a tech bubble by many people.

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