public static function remove_author_meta_values() {
		global $blog_id;

		if ( isset( $blog_id ) && ! empty( $blog_id ) ) {
			$blogusers = get_users( array( 'blog_id' => $blog_id ) );
			foreach ( $blogusers as $user_object ) {
				delete_user_meta( $user_object->ID, 'post_subscription' );
				delete_user_meta( $user_object->ID, 'comment_subscription' );
			}
		}

	}