I tried both AutoFacebook 2.0 and AutoFacebookLite with Zencart 1.3.9f.

Autofacebook 2.0 fails to run the facebook_authorize, with the same error as efo.buy-lowest
"Notice: Undefined offset: 0 in html/facebook/facebook_authorization.php on line 970

Success!

Your page's ID is:

Notice: Undefined offset: 0 in html/facebook/facebook_authorization.php on line 972
Your page's Token is:
Hence both ID and token cannot get."

Autofacebook Lite fails because something is screwed with the configuration page. You're asked to enter a username ( is this the facebook username or a username on the Zencart? ). This feild is initially coming up as profile.php, which I suspect is actually supposed to be the third item in the list down?