The entrepreneurs that really make it are the ones that start with an idea but are ready to change it at a moment's notice.

Choose something you are passionate about - or a pain point that has affected you and that you feel really needs to be changed.

If somebody writes a review of a dry cleaner, that piece of content is not wildly viral. It's not like a viral video that can spread across the world in a matter of minutes, so as a result, each market is almost an island unto itself.

Everyone is panicked about the transition to mobile. I don't lose any sleep whatsoever.

A lot of what Groupon is generating is demand for something people didn't know they wanted.

One of the challenges of buying local advertising is, how do you know if it worked? How do you know if it's got value? We're moving toward an e-commerce experience for local, an Amazon-like experience for local.

There are so many businesses that are succeeding on Yelp that don't pay us a dollar, and we're really excited about that.