Here's what you should say [to an investor]: 'this is what my company does' It's that simple. What you're trying to do is get potential investors to fantasize about how your product or service will make a boatload of money. They can't fantasize if they don't know what you do.

Knowledge is great. Competence is great. But the combination of both encourages people to trust you and increases your powers of enchantment. And in this world, the combination is a breath of fresh air.

When you give people too many choices it makes them hesitate and not buy stuff.

The most powerful sign is that your work no longer enchants you - it's not deep, delightful, and mutually satisfying. When this happens, it may be time to look for new challenges.

Coming from the U.S., you tend to look at one homogeneous market with 350 million people. But in Europe, every country has its own customs and laws.

Klout and various measurements of influence are fun. I love to see where I score on them, but there's a computer algorithm behind the calculation. If there's an algorithm, it can be gamed. Even if it's not gameable, you have to take a leap of faith that the number of followers, retweets, mentions, whatever really mean something.

I have four kids in a private school who have not yet entered college. Their tuition is what keeps me motivated. Life is simple sometimes.