Nearly silently Oracle integrates in the latest Release of Oracle WebCenter Suite 11.1.1.2 a new service: People Connection Service.
People who are registered with Services like Linkedin or Xing will feel really familiar :-) So now Oracle is also providing a complete Social Networking Stack.
More details on People Connection Service can be found in the Documentation, just search for "People Connection"
A sample in Oracle TechNet is also availabile, click here :-)