Saves a newly signed up social login. In case of auto-signup,
        the signup form is not available.

def save_user(self, request, sociallogin, form=None):
        """
        Saves a newly signed up social login. In case of auto-signup,
        the signup form is not available.
        """
        u = sociallogin.user
        u.set_unusable_password()
        if form:
            get_account_adapter().save_user(request, u, form)
        else:
            get_account_adapter().populate_username(request, u)
        sociallogin.save(request)
        return u