Nearly half of all 18-29 year olds (45%) who use the internet on their cell phones do most of their online browsing on their mobile device.
— Aaron Smith
Responsive Design
Responsive Web Design (RWD) is an approach which provides an optimal viewing user experience for content across a wide range of devices with a minimum of resizing, panning, and scrolling—across a wide range of devices (from desktop computer monitors to mobile phones).
Primacy of mobile for 18 to 29 year olds
Content is the platform
You put water into a cup, it becomes the cup. You put water into a bottle, it becomes the bottle. You put it in a teapot, it becomes the teapot. — Anon.