function bp_get_root_domain() {
		$bp = buddypress();

		if ( ! empty( $bp->root_domain ) ) {
			$domain = $bp->root_domain;
		} else {
			$domain          = bp_core_get_root_domain();
			$bp->root_domain = $domain;
		}

		/**
		 * Filters the "root domain", the URL of the BP root blog.
		 *
		 * @since 1.2.4
		 *
		 * @param string $domain URL of the BP root blog.
		 */
		return apply_filters( 'bp_get_root_domain', $domain );
	}