This document discusses mobile and tablet usage trends and provides recommendations for designing effective mobile websites. It notes that over one third of Facebook users and 50% of Twitter users access those sites via mobile. By 2015, two-thirds of the world's mobile data traffic will be video. When designing mobile websites, factors to consider include small screens, load times, touchscreen support, and media types. HTML5 and responsive design using CSS media queries allow sites to adapt to different devices. Recommendations include defining mobile needs, studying past data, using single-column layouts, vertical hierarchies, and tappable instead of clickable elements.