The document discusses analyzing social media traffic and visitor behavior on the National Geographic website using their web analytics tool, Omniture SiteCatalyst. It describes how they categorized social media referrers into meaningful groups like social news sites, social networking, social media sharing, and social bookmarking. Analysis of the data showed that while social media drives a lot of traffic, visitors from these sites tend to be less engaged than average visitors and account for a small portion of total page views and conversions. However, content that gets shared on social media can have a multiplier effect by reaching new audiences.