Instagram is the new social network photos only can be used exclusively by a smartphone, IPhone or Android.
It's an application and at the same time a camera especially engaging, allowing us to square to take photographs, apply photographic filters Lomo very characteristic style and share other social network accounts (Facebook,Twitter etc..)
In the same way as Twitter lets you follow and be followed by other users, comment on the shots of others and to indicate the preference of some photos by clicking the "like". So when you open the application you are in front of the succession of photos of people you follow, as well as you will be in the feed of those who follow you; more "Likes" and more comments has some photos, most likely end up in a special list of the most popular
Why does it work Instragram? Well it is very easy to use, uploading photos is fast, the geolocate and allows you to create new points geolocated by naming them as you wish, not to mention that hooking to other Social has a viral effect monstrous.