This document discusses social media metrics and analytics. It describes how different social media platforms are used, including Facebook for personal connections, Instagram and Snapchat for celebrities, and Twitter for global sports. It also covers the development of web analytics APIs, common social media metrics like followers, shares and impressions. The document discusses tools for analyzing social networks on different platforms, including Facebook Insights, Twitter Analytics, NodeXL and Klout. It explores how network analysis can provide insights into influence and information flow through social media.