Systrom says that every day, Instagram gets a barrage of requests from people for an Android version of its app. The good news is that it's on the horizon.

"It's hugely important to us, but we're only six people," he says. "Android is a major priority for us, but first we have to build the team, and find the best people in the world to work on these projects." The company is currently hiring engineers and designers to help it move more quickly on all three of these aims.