Yesterday evening I did also a bit of research before I started to build the workaround mentioned here.
Maybe as background information, - why the Facebook logout is such a big challenge - this is EVERYTHING, what Facebook provides in their current documentation:
"Logout Procedure
To enable a user to logout of Facebook, POST to http://www.facebook.com/logout.php, with the parameter "confirm" set to 1."
While I researched, I found some other guys (in the Facebook Developers Discussions), who also struggle with the logout ;)
Topic: Logout Procedure and Topic: Log-out
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This just as a tiny addition to the other posts ;)
-Joern