No matter what your mission is, have some notion in your head. Forget the model, whether it's government or nonprofit or profit. Ask yourself the more important question: Is my mission improving the world? Are you sure about it? Seek to disconfirm that all the time. And if you can, change your mission.

So growing ecommerce in the marketplace is key to being able to attract more advertisers. What we can do that some other people can't do is we can connect the dot between an ad you may have paid for digitally and a subsequent purchase in a physical store so that you can see the ad actually worked. So it too is an omni business for us.

Focus relentlessly and passionately on the customer.

I told all of our original investors that they would lose their money for sure.

I constantly remind our employees to be afraid, to wake up every morning terrified. Not of our competition, but of our customers.

We hold as axiomatic that customers are perceptive and smart... But there is no rest for the weary.