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.

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

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.

Everyone is panicked about the transition to mobile. I don't lose any sleep whatsoever.

I think with every successful consumer Internet business, there will be lawyers that are interested in going after your company, especially when they think that there's a financial incentive.

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.