public function requireDefaultRecords() {

		// init parent
		parent::requireDefaultRecords();

 		//
 		$pages = SiteTree::get();
 		if ($pages->count() > 0) {
 			$count = 0;
 			foreach ($pages as $page) {
				if ($page->OpenGraphData == null) {
					$page->OpenGraphData = json_encode(self::$OpenGraphProtocol);
					$page->write();
					$count++;
				}
 			}
			if ($count > 0) {
				DB::alteration_message('Open Graph Data added to ' . $count . ' page(s)', 'created');
			}
 		}

 	}