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

Starting a company, your success is going to be very dependent on how you adapt. You're going to make decisions, you're going to make bets; most of them are going to turn out to be wrong.

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

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.

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

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.

Consumers are empowered by Yelp and tools like it: before, when they had a bad experience, they didn't have much recourse. They could fume, but often nothing else other than tell their friends.

Maintaining the trust of the consumer is critical to our business

In the very beginning, Yelp started as a service where we really didn't think people would write reviews for fun. The whole concept of user-generated content was pretty nascent in 2004.

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

I'm not going to lie: there are no good options here.

There are times when looking on the bright side takes a lot ot work. I'm taking a break from it tonight. I'll be back at it tomorrow.

This organization (United Nations) is created to prevent you from going to hell. It isn't created to take you to heaven.

Every time we pray our horizon is altered our attitude to things is altered not sometimes but every time and the amazing thing is that we don't pray more.

. . . no Black woman can become an intellectual without decolonizing her mind.

The intellect is no longer the chairman of the board - it is an employee. It becomes a tool in the service of the heart.

A man is not a wall, whose stones are crushed upon the road; or a pipe, whose fragments are thrown away at a street corner. The fragments of an intellect are always good.

In kindergarten, you can learn how to be a citizen of the world.

You know, I'm pro-troops, but I'm not pro-war.

At Harvard I majored in chemistry with a strong inclination toward math.