If you're building a social product, you're still living in the last century if your product doesn't work on Facebook.

Media is very different from financial services. People are very fickle and very vocal. They believe that things should be one way and not the other. It's still very rewarding to build products for huge audiences. It feels like you're making an impact.

If I see what you're up to on Facebook but I don't see your updates on Flickr, I'll still care about Facebook.

You're going to pull out your phone and try to use whatever is the most appropriate app on your iPhone or your Android device. Yelp saw that very early on. And when we launched the mobile product, we saw immediate growth, and we were stunned.

If you can work a brand successfully into the narrative of your product, then it's really cool. Then people actually take the brand up and say, 'My positive experience in your product is directly connected and influenced by this brand and that worked great.

Being an entrepreneur is not about being in love with an idea, it's about being in love with running a company.

If we compare the two, Facebook is currently a superior place to market a product like Slide. Twitter is more like a general distribution agent. It's like broadcast radio.