Over 100 million people use the Instagram app to take beautiful, lo-fi photos of the special moments in their lives, and then instantly share them with the world. The first-ever crowd-sourced book of Instagram photos, This is Happening highlights that single, fleeting moment that makes us happy and just begs to be photographed--the perfect cup of coffee, a scenic moment on the morning commute, the joy of new shoes, a loved one's shy smile...