WP Balita theme - FB meta

################################################################################
// Add meta for facebook
################################################################################

    add_action('wp_head', 'tk_head_facebook');
    function tk_head_facebook(){

        if (tk_is_single_product()){
            global $post;
            $image_url = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'medium');

            echo "\n".'<meta property="og:url" content="'.get_permalink($post->ID) .'" />';
            echo "\n".'<meta property="og:description" content="'.$post->post_content.'" />';
            echo "\n".'<meta property="og:image" content="'.$image_url[0].'" />'." \n";
        }
    }

?>