title: Posting an image on google+ using interactive post
body: <p>Is there any way to add an image to a interactive post on google+? </p>
  
  <p><a href="https://developers.google.com/+/web/share/interactive" rel="nofollow">https://developers.google.com/+/web/share/interactive</a></p>
  
  <p>It looks like it pulls the image from the <code>contenturl</code> parameter. But I don't seem to be able to control this image in any way. Maybe there is some sort of open-graph like markup that we can put on this page?</p>