Hello Basava,
SAP Cloud Identity is a SaaS solution that offers SAML IDP with social sign-on capability.
There is not social sign-on available for SAP NetWeaver Administrator out of the box.
SAP Netweaver Application Server Java accepts SAML 2.0 assertions for SSO. Your users could be authenticated to the SAP Cloud Identity (SAML IDP) using social authentication (Facebook), then the SAML 2.0 assertion, issued by the SAP Cloud Identity, could be used for SSO to the SAP Netweaver Application Server Java.
You can find more details how to enable SAML 2.0 authentication for AS JAVA here:
Setting SAML 2.0 Policies for Authentication - User Authentication and Single Sign-On - SAP Library
Best regards,
Donka Dimitrova