React.com offers web services to connect your web site or mobile application with a continuously growing broad selection of social networks. No need to ask your users for passwords and profiles, let them register and log in with their social network accounts through social sign-in integration. For quick integration we offer hosted services which will allow you to directly use social network functionality by just adding HTML to your website. For in depth integration we provide a Unified Social API, which allows you to call the specific functions of social networks, without having to implement their specific protocols or workflow. By bundling all your API calls to the different social networks, you build a social user database with the information your users share with you, accessible from all your web sites and applications.