Ross Sorkin says the information put out in Groupon's IPO filing by the investment banks and other information raises warning signs. Groupon has $225 million in the bank, lost $102 million in the 3rd quarter 2011 on revenue of $878 million. The company has current liabilities of $681 million and only $376 million in assets. It owes vendors $392 millon as part of the current liabilities. Groupon spent $432 million in the first 6 months of 2011 on marketing. Other information shows Eric Lefkovsky, Groupon's chairman, sold a dotcom company in 1999 which went into bankruptcy a year later. And of the $950 million in a pre-IPO round in January 2011, Groupon paid out $810 million to investors and employees. Of this Mr. Lefkovsky and his wife were given $319 million. Goldman Sachs is the lead underwriter behind Groupon's IPO offering. Because of the huge fees involved investment banks and accounting firms were willing to come up with inflated valuations and a questionable metric called Adjusted Consolidated Segment Operating Income, that showed operating income excluding major marketing and acquisition related costs....