This document summarizes key trends in global audiences and advertising from various reports. It notes that the global ad market is worth $1.19 trillion annually, nearly 40% of the global population is online, and mobile internet is increasingly important, especially for 16-24 year olds. However, ad markets do not fully reflect consumer behaviors, and audiences are generally not paying for online news. It also discusses the growth of ad blocking and disruption of traditional business models for publishers.