In January 2011, Instagram had just one million users on their app, which seems like a lot, but it’s nothing compared to where they’re at now. By the end of 2011, they were at 15 million users, and now just four months later, that number has doubled to 30 million. The five million android users they’ve picked up in the last week have certainly helped. So then… Facebook buys Instagram.

http://www.expertphotography.com/facebook-buys-instagram-what-will-this-do-for-photography/