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

In my fourth grade classroom, I even instituted a government structure, because I was really interested in people having positions and there being law.

You can be a couple in London who happen to take pictures of their breakfasts every day - it's called @symmetrybreakfast - and you can gain hundreds of thousands of followers overnight because people are genuinely interested in your unique angle on the world.

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.

I've always been into taking my photos, cropping them square, putting them through a filter in Photoshop.

Our goal is to not just be a photo-sharing app, but to be the way you share your life when you're on the go.

If you've got an idea, start today. There's no better time than now to get going. That doesn't mean quit your job and jump into your idea 100 percent from day one, but there's always small progress that can be made to start the movement.