The companies that I really admire the most are the ones that have a deep visceral understanding of why people use their service, and they figure out ways of making money that are completely consistent with how people are feeling and what they are doing at the time.

I always describe Facebook and Twitter to some extent as 'them time': it's time about the world and what's outside of you. Pinterest, for a lot of users, is 'me time.' What do I want my future to be? Who am I? What are the things I want to do?

When you open up Pinterest, you should feel like you've walked into a building full of stuff that only you are interested in. Everything should feel handpicked for you.

So March 2010, we launched Pinterest, and we were at 3,000 accounts. And that wouldn't be so bad if we hadn't started building Pinterest actually in November 2009. And that alone wouldn't have been so bad if I hadn't left my job to start a company in May 2008.