People interact with their phones very differently than they do with their PCs and I think that when you design from the ground up with mobile in mind, you create a very different product than going the other way.

Focusing on one thing and doing it really, really well can get you very far.

Every photo you take communicates something about a moment in time - a brief slice of time of where you were, who you were with, and what you were doing.

People always told me photos have been done. My feeling was, these people are wrong.

Having a company that's successful is a wonderful platform to do new things. You don't have to raise money for it; you can take profits from the company and pump them into new business.

Above all else, products spread when they're useful and they're usable

Obviously, being the CEO, there are a lot of eyes on what you do and what you post and how you post, and I think one of the challenges of Instagram in general is that, as we get bigger, there are just more voices in the room, more eyes on everyone's accounts.