Those are some reasons why many people my age tend to use Instagram more than they do Facebook. Everything about the application makes it less commercialized and more focused on the content, meaning more teens are inclined to visit it. When we do visit the application it is a much more pleasant experience so we are more inclined to Like and interact with the posts more. This increases our interaction with the application, meaning we will use it more, etc.
A very nice read about how social media nowadays change how people are reached by each others, but still as my parents said, making call is still the easiest one.