Implementing Social Sign-On to SAP Netweaver 7.31 by using Facebook account

I have to implement single sign-on functionality between Facebook account and sap Netweaver AS Java 7.31. So that, UME users should be able to login into SAP Netweaver Administrator without entering there SAP Netweaver user id and password. Instead, they should be able to login by entering there Facebook user id and password. For example: Suppose there are 5 UME users accounts in SAP Netweaver Administrator with the following names or ids "A", "B", "C", "D", and "E". When user "A" clicks on Facebook login button he has to login into his account on SAP Neweaver portal and it should be same for the other users also. My system details SAP Netweaver Application Server Java 7.31 running on Windows 7 OS SAP Netweaver Developer Studio 7.31(Eclipse) Could anyone please help me to implement the above functionality.