def checkpoint_followers_diff(self, cp):
    """
        Returns user_ids of users that follows you now
        but didn't follow you at checkpoint time.
    """
    self.logger.info("Getting checkpoint followers difference.")
    current_followers = [item["pk"] for item in self.getTotalSelfFollowers()]
    old_followers = cp.followers
    return list(set(current_followers) - set(old_followers))