The document discusses how companies can harness the power of word-of-mouth marketing, or "groundswell", to boost their business. It recommends that companies energize their most enthusiastic customers to serve as advocates by enabling user connections and supporting user communities. Executives must embrace user feedback and input to continuously improve products and services. Fostering internal collaboration through tools like wikis and blogs can also create a groundswell within a company by engaging employees. Overall, being responsive to customers and empowering employees transforms a company through a shift in thinking brought on by shared successes.