Sources

WSJ.com: MarketBeat Blog - WSJ.com: Morning MarketBeat: Stocks Can’t Go Straight Up Forever

Paul Kedrosky: Groupon QotD: "A business just doesn't go sideways and go in another direction overnight." http://t.co/IC0Cey39

Mathew Ingram: WSJ says the SEC is investigating Groupon's recent restatement of its financial results: http://t.co/d62xZpra

Anthony De Rosa: The SEC has opened a probe into Groupon, no formal investigation launched http://t.co/WRfFdyNB

felix salmon: RT @mhbergen: "A Groupon spokesperson declined to comment. A SEC spokesperson declined to comment." http://t.co/M5qOiDtt #derp