I had a problem with the incorrect url's being passed to Facebook and no images which took me around 6 hours to figure out! THIS WAS NOT THE FAULT OF THIS EXTENSION. The problem is with Gzip compression. Turn off Gzip compression in System > Global Configuration > Server and it works as it should. This is a Joomla/Facebook/Gzip compression problem and not a fault with this extension, it affects all Joomla/Facebook extensions to my knowledge.