First, I apologize in my poor English.
I wrote to the author, but I did not solve the problem.
I think this extension is not compatible with sh404sef.
When I first publish items on the FB, I do not get a picture of the items.
I delete the published news and do the re-publish and I get the normal picture.
I tried to make an extra page on my profile (to post items without a picture on it) in order for the other to be neat publish. After a couple of hours, the new page added will be unlink?
You can see the image in the attachment.
When I do disable sh404sef everything works neatly. (normally Fb and pictures)
Please make the author fix Bug fix and update.
I also suggest that a log for the extension be created, and insert an option to set additional time for publish items. (Due to the pages turn on cache ).