title: External Identity provider for WSO2 Identity server
body: <p>It is possible to authenticate users with Facebook account, google account, twitter etc... through Oauth? (In the case of a web application try to access to a protected ressource)</p>
  
  <p>I understood that WSO2 Identity Server can act as an authorization server and provides its own access token but it is possible to authenticate user if facebook or google provide access token after user authorize retrieving its info?</p>