我已将开放图元数据添加到functions.php:

function insert_fb_in_head() {
  global $post;
  if ( !is_singular())
    return;
        echo \'<meta property="fb:admins" content="PAGE_ID"/>\';
        echo \'<meta property="og:title" content="\' . get_the_title() . \'"/>\';
        echo \'<meta property="og:type" content="article"/>\';
        echo \'<meta property="og:url" content="\' . get_permalink() . \'"/>\';
        echo \'<meta property="og:site_name" content="SITE_TITLE"/>\';
        echo \'<meta property="og:image" content="\' . $default_image . \'"/>\';
}
add_action( \'wp_head\', \'insert_fb_in_head\', 5 );

我还尝试添加：

og:image:secure_url