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

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

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.

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

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

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

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.