Instagram is a free photo-sharing application that allows users to instantly apply filters and frames to newly taken photos, and share them via Instagram or many other social networks, including Facebook, Twitter, Foursquare, Tumblr, Flickr, VKontakte and Posterous. The app works on all iOS devices and allows you to take square-shaped photos like retro cameras used to do it. In September 2011, the second version of the app was released, which became even more incredible success in the App Store, as a result of which it received the “iPhone App of the Year” award.