def followers_qs(self, actor, flag=''):
        """
        Returns a queryset of User objects who are following the given actor (eg my followers).
        """
        check(actor)
        queryset = self.filter(
            content_type=ContentType.objects.get_for_model(actor),
            object_id=actor.pk
        ).select_related('user')

        if flag:
            queryset = queryset.filter(flag=flag)
        return queryset

        Returns a queryset of User objects who are following the given actor (eg my followers).
        
actstream/managers.py