This document discusses the growing importance of mobile devices and tablets for internet usage. It notes that mobile internet usage now accounts for 10% of all usage, up from 1% in 2009. 29% of US adults now own a tablet, up from 2% in 2009. The document recommends that websites adapt to the smaller screen sizes of mobile devices by removing unnecessary content, using responsive design, focusing on core calls to action, and building both mobile-optimized websites and dedicated apps. It provides examples of how Gmail and Facebook have successfully adapted and provides recommendations for how (ur)biz can build for mobile.