Instagram (gained popularity)

After its launch in 2010, Instagram rapidly gained popularity, with one million registered users in two months, 10 million in a year, and 800 million as of September 2017. In April 2012, Facebook acquired the service for approximately US$1 billion in cash and stock. As of October 2015, over 40 billion photos had been uploaded to the service. Although praised for its influence, Instagram has been the subject of criticism, most notably for policy and interface changes, allegations of censorship, and illegal or improper content uploaded by users.