title: Facebook og: image appears blank
body: <p>I currently having a problem with FB OG image on Feed status of <a href="https://3dl.aut.ac.nz/" rel="nofollow noreferrer">https://3dl.aut.ac.nz/</a>.
  On profile status. This works fine. It appears that the bug is only happening on HOME(news feed page) status</p>
  
  <p><img src="https://i.stack.imgur.com/3vV53.jpg" alt="Facebook Image Bug"></p>
  
  <p>The site is built in wordPress. Normally I don't stuck on og image on my previous works on WordPress. 
  On <a href="https://developers.facebook.com/tools/debug/og/object/" rel="nofollow noreferrer">fb object debugger</a>, the site has the correct og image and seems no problem at all.</p>
  
  <p>I suspect its because im using secure server? (https://) Also same thing happens if I try, <a href="http://3dl.aut.ac.nz/" rel="nofollow noreferrer">http://3dl.aut.ac.nz/</a> (http).</p>
  
  <p>I investigated this issue and found another similar thread on stackoverflow <a href="https://stackoverflow.com/questions/8855361/fb-opengraph-ogimage-not-pulling-images-possibly-https">thread</a>. The thread says that this has been an issue with https. However, the facebook.com has a thumbnail when posted the link on FB status.</p>
  
  <p><strong>Is this issue has something to do with the server settings?</strong></p>
  
  <p>Any help will be greatly appreciated.</p>