Social computing has revolutionized the way individuals connect with one another and manage their personal lives. The technology has launched billionaire entrepreneurs and influenced presidential elections. For businesses the same technology has meant a revolution in online marketing. Different types of social computing applications offer different opportunities for marketing, but all relate to the opportunity for companies to improve their connections with current and potential customers. This chapter will explore both the history of marketing and social computing and how the two fields have come together to revolutionize online marketing today.