Feeling a bit disconnected to the business world? LinkedIn wants to help. The firm operates an online professional network designed to help members find jobs, connect with other professionals, and locate business opportunities. The site has grown to reach more than 430 million users in some 200 countries since its launch in 2003. LinkedIn is free to join; it offers a paid premium membership with additional tools and sells advertising. It additionally earns revenue through its job listing service, which allows companies to post job openings and search for candidates on LinkedIn. In 2016 Microsoft paid $26.2 billion to acquire LinkedIn.