unction wpc_fb_opengraph() {
$wpc_image_url = wp_get_attachment_image_src( get_post_thumbnail_id(), 'large');
?>
<meta property="og:site_name" content="<?php bloginfo('name'); ?>" />
<meta property="og:description" content="<?php echo strip_tags(get_the_excerpt($post->ID)); ?>" />
<meta property="fb:admins" content="1566644629"/>
<meta property="fb:app_id" content="135847609824276">
<?php }

add_action('wp_head', 'wpc_fb_opengraph');