The document introduces Yammer as an enterprise social networking tool that can revolutionize the way employees work. It discusses how knowledge workers currently spend significant time searching for and recreating information, costing companies millions per year. Yammer aims to address these issues by providing an easy and shared way for employees to communicate and access information in real-time through messaging, files sharing, groups and other features accessible anywhere via the web, desktop and mobile apps. Case studies show how companies have used Yammer to increase productivity, collaboration and knowledge sharing across their organizations.