Inzkeeper writes: Groupon CEO Andrew Mason made public an email he sent to Groupon employees. He takes responsibility for the company's downturn, expresses his appreciation for his staff, and wishes them well. "For those who are concerned about me, please don't be — I love Groupon, and I'm terribly proud of what we've created. I'm OK with having failed at this part of the journey. If Groupon was Battletoads, it would be like I made it all the way to the Terra Tubes without dying on my first ever play through."