The biggest thing is to create a product that consumers find useful. As more and more people like something, it becomes harder and harder to have a conspiracy theory about it.

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

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.

Yelp is in a very nice spot: local data, and especially review data, is one of the killer apps on mobile phones.

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

Starting a company, your success is going to be very dependent on how you adapt. You're going to make decisions, you're going to make bets; most of them are going to turn out to be wrong.

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.