This document discusses the power of social media communities. It notes that social media usage has increased 54% over 2010, with over 800 million people using Facebook. Having an online community enables innovation, collaboration, evangelism, and loyalty. It also discusses how to measure engagement through followers, influence, sentiment, and growth. Additionally, it covers how to maintain and grow communities by participating in conversations, sharing 10% of your own content, and acting as a storyteller, caretaker, and connector both internally and externally.