I happened to be clicking around and saw Perl.com had an entry called Writing on Walls with Facebook::Graph. Neat! It was preceded by Facebook Authentication with Perl and Facebook::Graph. I made a mental note to remember that and then Linux Magazine sent an article called FBCMB: Command Line for Facebook. Although somewhat unrelated, that sent me off to look for more Perl modules for Facebook only to find someone had already covered it in a blog entry called Writing a Facebook Applications in Perl.
Anyway, if, like me, you didn't know there was a lot of Perl resources for Facebook - now you do.