1. The example on

   NAME
          WWW::Facebook::API - Facebook API implementation
   SYNOPSIS
              use WWW::Facebook::API;...

does NOT work anymore.

You will get "parameters uid or session key required".

Please also kindly rewrite and test the example using
use strict;
use warnings FATAL => 'all';

and leaving
use strict;
there in the documentation.
You need to declare $token.

2. Please add warnings to the package description that this package is
apparently part of the _OLD_ REST API,
http://developers.facebook.com/docs/reference/rest/
**"If you are new to the Facebook Platform, we recommend you use our new Graph API instead."**