I think the big thing about Groupon is just people had never seen anything grow quite so fast.
Hire great people and give them freedom to be awesome.
Most of the time, the things that really change the world exist for something fundamentally selfish and then the world-changing ends up being a side-effect of that.
It takes some experimentation to figure out what people like and don't like.
I'm weird. But I'm a pretty serious person.
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.