title: CAS Server that supports Facebook/Twitter authentication via OAuth
body: <p>I'm looking for a CAS server which supports Facebook/Twitter authentication via OAuth for Single-Sign-On. I've checked JASIG-CAS server but it doesn't look support them. My java web app is based on Spring Security 3 and other external PHP apps. Does it exist a CAS server with Facebook/Twitter support? Or an extension (or sample code) for this support on JASIG?</p>