The document discusses using electronic word-of-mouth (eWOM) on social media to increase return on investment (ROI). It examines how to measure eWOM engagement and the types of content that sparks positive eWOM. Case studies on Zappos and Hokey Pokey ice cream show that building communities and incentivizing influencers to spread positive messages can lead to increased brand awareness, ROI, and sales revenue from social media campaigns. While many social media users are inactive, the document concludes that eWOM through true engagement and influential individuals within a community sense can directly impact a business's ROI.