This document discusses the rise of social media and social influence marketing. It notes that social networks have reached widespread global penetration led by Facebook. It then outlines key social media activities like video watching and blogging across different regions. The document advocates developing a social influence marketing strategy that integrates paid, owned, and earned social media platforms and their measurement. It proposes measuring brand health through a social influence marketing score that considers the sentiment and reach of a brand on social media. Finally, it argues that successful marketing now requires adapting to the constant change of the digital environment through multiple, coherent messages rather than a singular consistent one.