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

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

Maintaining the trust of the consumer is critical to our business

On mobile, what are the core apps? It's basically messaging, mapping and review data.

Theres simply anger over the accountability that Yelp brings and also this feeling of powerlessness because so much power is now being put in the hands of the consumer. But the important thing that gets lost with some of these business owners who are very upset with us is its the whole picture that counts.

There is this cat and mouse game that plays out over time where our team comes up with new and interesting ideas to identify content that we shouldn't recommend, and over time people are constantly probing that, trying to figure out how can they get around that and get a better reputation on Yelp.

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.