Ok, I had a plugin corruption and deleted the facebook plugin via FTP as I was getting this error message and could not access my admin panel:
Fatal error: Class 'Facebook_Social_Publisher_Settings' not found in /home/********/public_html/wp-content/plugins/facebook/admin/migrate-options-10.php on line 191
I downloaded a fresh copy of the plugin from here and once installed I get the exact same problem.
I've had to delete the fresh install of the plugin via FTP again
Please Help !!