Facebook definitely recognized the growth opportunities in Instagram when it bought the company for $1 billion in stock and cash back in 2012. First launched as an iPhone app in 2010, the service had 50 million monthly active users by September 2011. By December 2014, that number had ballooned to 300 million. And today, Instagram has announced

Source: Hot Hardware – Instagram Tops 500 Million Users, Now Bigger Than Twitter