If you have your own Shindig server setup, your can enter the URL to the server here. If you do not have your own Shindig server, you can either leave the URL empty, or you can use "http://social.atutor.ca/shindig/php" to connect to the ATutor social network. Shindig allows users to link gadgets from other sites into their social networking environment, as well as communicate with those in other social networks. If you choose not to use a Shindig server, your social network will function as a self-contained network, without access to external networks.