is a mobile, desktop, and Internet-based photo-sharing application and service that allows users to share pictures and videos either publicly or privately. It was created by Kevin Systrom and Mike Krieger, and launched in October 2010 as a free mobile app exclusively for the iOS operating system. Instagram lets registered users upload photos or videos to the service. Users can apply various digital filters to their images, and add locations through geotags . Users can connect their Instagram account to other social media profiles, enabling them to share photos to those profiles as well. After its launch in 2010, Instagram rapidly gained popularity, with one million registered users in two months, 10 million in a year, and ultimately 700 million as of April 2017. Its users have uploaded over 40 billion photos to the service as of October 2015. As of April 2017, Instagram Direct has 375 million active users, while, as of June 2017, the Instagram Stories function