GROUPON/

The Groupon smartphone app is displayed on a Motorola Droid Bionic cell phone in Denver November 4, 2011. Groupon Inc raised $700 million after increasing the size of its initial public offering, becoming the largest IPO by a U.S. Internet company since Google Inc raised $1.7 billion in 2004. REUTERS/Rick Wilking (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY)