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.

I didn't realize how hard it was to run a small business.

When you think of couponing, you picture a mom cutting coupons out of the back of the newspaper.

You're building a tool, not a piece of art. Don't be blinded by the vision.

Local commerce, without question, will be one of the fundamental use cases enabled by mobile devices over the next several years.

If you don't have those moments where you go too far, then you're probably not going far enough.

Admit your errors before someone else exaggerates them.