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, big data, and word clouds. Social media measurement is used to achieve business goals like revenue, costs, and satisfaction. Key metrics discussed include likes, followers, traffic, and impressions. The document also covers costs of ignoring social media, Facebook insights, Twitter analytics, network analyses, information theory/models, and tools for analysis like NodeXL.