LinkedIn is a social networking Web site where people maintain profiles and create connections with associates. It is explicitly designed for professional interactions. The site has roughly 200 million members, with roughly one-third of its traffic coming from the United States. Profiles are extensive and focus on education, work experience, projects a person has worked on, and a list of skills that others endorse. This chapter presents an overview of the different types of information people share on the site and how to find those people.