Thanks for the plugin. I have installed it and given some default files. But whenever someone presses the "Recommend" button for fb on our sites (not the Fb like buttons), wrong thumbnails are shown. I used the lint tool more than 24 hours ago and the lint tool now displays the correct thumbnails. But when you click on the recommend button, it still shows the wrong thumbnails.
The Fb recommend buttons are in the sidebar of the following sites. All of them have this issue:
P.S. We're not using multi-site (network of sites) so that is not the issue here.