LinkedIn is a free social network for professionals in which people can create a profile, connect with peers, and network with over 300 million users. Not specifically designed for academics or researchers; however, you can list your publications and other research outputs, experiences, skills and current and past positions. It is a good tool to use if you are looking for exposure in broader communities, including industry, business or government. Simply create an account and begin making connections by adding people you know and people you don't!