The key reason people use Instagram is not about filters. Which is why Hipstermatic which was far more popular at first let most of their employees go.<p>There is a level of context around Instagram pictures. The cropped square image that is easy to consume as you scroll, the filter, the way the geolocation data is shown and the way you like and interact with the picture.<p>The way you interact on Twitter is different to Instagram. When I see someone Instagram a picture I will rarely comment but when I see a post on Instagram I'll interact with most posts. Instagram isn't necessarily especially brilliant but all of this is about context. You don't post the same content on Twitter and Facebook.