Occasionally you may post a link to an article that is on a WordPress site and the embed won't show. If you hover over it, you see "refused to connect". This is caused by the WordPress site using "x-frame-options: sameorigin" in their HTTP response header and your browser will refuse to load the embed. We use OEMBED and WordPress supports OEMBED, but, if the site has that setting in their headers, your browser will not allow the embed to show. The site owner may not be aware of this and sending them an email might persuade them to suppress that setting on their server.