A functions file for adding open graph tags to WordPress site

wp-functions

// read more here: http://garage.socialisten.at/2013/06/new-open-graph-tags-for-article-publisher-author/
// (c) @michaelkamleitner
 
if ( ! function_exists('additional_opengraph_tags') ) {
  function additional_opengraph_tags() {
 
    if ( is_single() and ! is_page()) {
    ?>
    <meta property="article:publisher" content="https://www.facebook.com/YourPageName" />
    <meta property="article:author" content="https://www.facebook.com/YourAuthorName" />
    <?
    }
  }
  add_action('wp_head', 'additional_opengraph_tags');
}