multiple authentication including facebook

Hi,
Does any one know how to implement multiple authentication in spring roo project using spring security and spring social.I wanna do two things.1)Authenticate user using my own application and database (which is working perfectly for me).2)Also I want to authenticate with Facebook so that user having Facebook id can login into the application.If any one have idea about how to implement it in spring roo project ,that will be a great help for me as a beginner?