Executives certainly claim to know what makes social media so potent: its ability to amplify word-of-mouth effects. Yet the vast majority of executives have no idea how to harness social media’s power. Companies diligently establish Twitter feeds and branded Facebook pages, but few have a deep understanding of exactly how social media interacts with consumers to expand product and brand recognition, drive sales and profitability, and engender loyalty. This article helps to demystify social media.