Groupon updates IPO filing, admits it's unprofitableGroupon updates IPO filing, admits it's unprofitableBy Julianne Pepitone @CNNMoneyTech August 10, 2011: 2:43 PM ET NEW YORK (CNNMoney) -- When Groupon filed in early June to go public, the daily deals company drew a barrage of criticism for its reliance on an unorthodox accounting practice that masked some of its losses. Bowing to the critics, Groupon amended its IPO filing on Wednesday to strip o
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