What a month it has been for Instagram. The lean and mean social photography app was just acquired by Facebook for a jaw-dropping $1 billion. Instagram for Android also launched at the beginning of April and has seen unprecedented growth.
Last we heard Instagram was wielding 30 million users, making it the biggest mobile-only social network in existence. According to new data, Instagram has now hit over 40 million users, and the app is averaging around one million new signups per day.