Instagram :

Instagram 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 freemobile app exclusively for the iOS operating system. A version for Android devices was released two years later, in April 2012, followed by a feature-limited website interface in November 2012, and apps for Windows 10 Mobile and Windows 10 in April 2016 and October 2016 respectively.

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 functionality has over 250 million active users. Instagram was acquired by Facebook in April 2012 for approximately US$1 billion in cash and stock. The popularity of Instagram has sparked an engaging community, including dedicated "trends", in which users post specific types of photos on specific days of the week with a hashtag representing a common theme. Instagram has received positive reviews for its iOS app, and it has been named "one of the most influential social networks in the world". However, the company has been the subject of criticism, most notably for policy and interface changes, allegations of censorship, and illegal or improper content uploaded by users.