I am using Backendless as my backend. They provide the option for Social login but their documentation says that:

"In order to integrate Facebook login with Backendless, client application must use the Facebook SDK to authenticate the user and then makes a Backendless API call to link the Facebook identity to a BackendlessUser instance."

https://backendless.com/docs/rest/users_facebook_login.html

Can you please suggest how we can achieve this with Draftbit?