Instagram is a photo-sharing application and it's very popular.
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 . 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 . 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 '' .