adding_facebook_open_graph_meta_data

//Adding the Open Graph in the language attributes
function add_opengraph_doctype( $output ) {
		return $output . ' xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml"';
	}
add_filter('language_attributes', 'add_opengraph_doctype');

//Adding Open Graph Meta Info

function insert_fb_in_head() {
	global $post;
	if ( !is_singular()) //if it is not a post or a page
		return;
        echo '<meta property="fb:admins" content="172503922814423"/>'; // fb user id
        echo '<meta property="og:title" content="' . get_the_title() . '"/>';
        echo '<meta property="og:type" content="website"/>';
        echo '<meta property="og:url" content="' . get_permalink() . '"/>';
        echo '<meta property="og:site_name" content="Mag+"/>';
	if(!has_post_thumbnail( $post->ID )) { //if the post does not have featured img, use default logo img
		$default_image="http://www.magplus.com/wp-content/themes/magplus_2/images/og-image-logo-blk.png"; 
		echo '<meta property="og:image" content="' . $default_image . '"/>';
	}
	else{
		$thumbnail_src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'medium' );
		echo '<meta property="og:image" content="' . esc_attr( $thumbnail_src[0] ) . '"/>';
	}
	echo "
";
}
add_action( 'wp_head', 'insert_fb_in_head', 5 );