<?php
        $fbog =& JFactory::getDocument();
        $opengraph_meta = '
        <meta property="og:title" content="'.$this->item->title.'"/>
        <meta property="og:type" content="blog"/>
        <meta property="og:url" content="'.JURI::getInstance()->toString().'"/>
        <meta property="og:site_name" content="YOUR_SITE_NAME"/>
        <meta property="fb:admins" content="INSERT_YOUR_FACEBOOK_ID"/>
        ';
        if (!empty($this->item->image)) {
            $opengraph_meta .= '<meta property="og:image" content="'.JURI::base().''.$this->item->image.'"/>';
        }
        else {
            $opengraph_meta .= '<meta property="og:image" content="http://imagedoomain.com/no-image.jpg"/>';
        }
        $fbog->addCustomTag( $opengraph_meta );
?>