I also just switched to the Polaroids theme. When I link/share my post on other sites, such as Facebook or Tumblr, the images or thumbnail don’t show on the other sites. I tried several plugins and codes that people shared, but none of them worked for me. At first I thought it was Facebook’s issue not being able to grab the image to my posts, but the same thing happened when I shared my post on Tumblr using the Tumble widget. I believe the issue lies with the Polaroids theme. Is there a way to get around this problem?
