code: def fetch_social_friend_ids(self, social_auth_user):
          
  
          # Type check
          self.assert_user_is_social_auth_user(social_auth_user)
  
          # Get friend finder backend
          friends_provider = SocialFriendsFinderBackendFactory.get_backend(social_auth_user.provider)
  
          # Get friend ids
          friend_ids = friends_provider.fetch_friend_ids(social_auth_user)
  
          return friend_ids
docs: fetches the user's social friends from its provider
          user is an instance of UserSocialAuth
          returns collection of ids
  
          this method can be used asynchronously as a background process (celery)