May 1, 2012
Perhaps Facebook’s Mark Zuckerberg was right and Instagram is worth the $1 billion his company paid for the photo-sharing app. Just weeks after becoming the social networking giant's latest acquisition, Instagram is adding 5 million new users per week, according to Mashable. Since being purchased by Facebook on April 9, Instagram’s customer base has grown considerably. At the beginning of 2012, the service had 15 million users; by April 1, that number had grown to 30 million. Two weeks after that, Instagram had surpassed 40 million users. Today, that number has risen to 50 million users.