def create_userblocks_instance(sender, instance, created, raw, **kwargs):
    """
    Create a |UserBlocks| for newly created |User|.

    .. seealso::
        :data:`~django.db.models.signals.post_save` built-in signal.
    """
    from friends.models import UserBlocks
    if created and not raw:
        UserBlocks.objects.create(user=instance)
