Social Directory describes a user's identity on Yahoo, including their Yahoo profile information and their relationships across places like Yahoo Mail and Yahoo Messenger. The APIs allow you to tap into that information to make your websites and your apps more social, increasing user engagement and creating distribution opportunities.
In order to access Social Directory data in your application, you’ll need to get a Yahoo API key and configure it to useSocial Directory. You can do this by creating a project for your application.
Previous versions of the Social Directory API utilized a Web Service as a way to access user's Social Directory data. Documentation for the previous Social Directory web service remain available, including a screencast explaining its use and the PHP and Flash SDKs.
Join the conversation on the Social Directory developer forum to get help and touch base with other developers.