Mason put out a letter to employees, showing his quirky side, but taking responsibility for some of the gaffe's Groupon has experienced as a public company.
"After four and a half intense and wonderful years as CEO of Groupon, I've decided that I'd like to spend more time with my family. Just kidding -- I was fired today," the letter read. "If you're wondering why ... you haven't been paying attention. From controversial metrics in our S1 to our material weakness to two quarters of missing our own expectations and a stock price that's hovering around one quarter of our listing price, the events of the last year and a half speak for themselves. As CEO, I am accountable."
-- Written by Chris Ciaccia in New York
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