All it takes is the swipe of a finger. You connect with friends. You buy gadgets and gear. You find out what's happening in the world. But with that same simple swipe, you cast an increasingly expansive shadow. With each connection, you leave a digital trail that tracks your every move and milestone, your every like and dislike. And it's not just people. Today, all major cities are networked. Urban infrastructures are monitored and controlled by complex operating systems.