Groupon CEO Andrew Mason wants you to know everything is O.K. At least that's what he told stockholders today in a four-page letter that reads more like a plea to stay than a bold vision for the future.

"The six months since our IPO have been rocky to say the least," he wrote. Indeed. Groupon's stock price has slid considerably since the IPO last year, falling from $20 a share to $10.55 a share today, and it would seem everyone is a little rattled.

Mason referred to this performance as "an unfortunate side effect of our unprecedented growth," and expressed confidence that the company's large scale would be cause for success in the coming months and years and not the daily deal site's undoing.