This document discusses trends in multi-screen usage and mobile commerce. It shows that smartphone usage has increased dramatically from 30% in 2011 to 62% in 2013. It also finds that many users engage in multi-tasking by using multiple screens simultaneously or sequentially to browse the internet, use social media, shop, and more. Specifically, 60% of users complement their mobile use with desktop or tablet, and 65% continue an activity started on their phone on another device. The document suggests marketers find out how many customers use mobile, assess the value it provides, and measure all mobile activities.