In early 2008, it was confirmed that there would be an opportunity to build applications for the iPhone. We were fortunate enough to make the right call on that: to bet early, to put resources into it and have a pretty good application in the store at the moment when it opened.

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.

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

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

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

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.

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.