The document discusses the rise of mobile usage and provides guidance on using Facebook mobile ads. It notes that in 2012, 1 billion users accessed Facebook on mobile devices and 1 billion smartphones were in use globally. Various types of Facebook mobile ads like sponsored stories, page post ads, and mobile app install ads are described as having high engagement, low costs, and being effective at driving installs and sales. The document emphasizes segmenting ads by device, country and other factors and thinking "mobile first" for social marketing strategies.