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

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

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

In the arts they call it plagiarism, in business they call it competition.

Groupon as a company - it's built into the business model - is about surprise. A new deal that surprises you every day. We've carried that over to our brand, in the writing and the marketing that we do, and in the internal corporate culture.

One of the challenges of innovation is figuring out how to wipe your mind clean about what you should be doing at any given moment, and not having a religious attachment to what's gotten you there thus far.

If you laugh a lot, when you get older your wrinkles will be in the right places.