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

You have to be very nimble and very open minded. Your success is going to be very dependent on how your adapt.

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

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

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.

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.