To spread news about CPAN distributions on Facebook, I wrote a little Facebook Application: CPAN Friends:
This application is for authors of Perl modules on the CPAN. If you add this application then whenever you upload a new distribution to CPAN, we'll add a story to your news feed about it.
Add the application if you are a CPAN author. Add the application if you want to see new CPAN releases from your friends. I'll be adding more features soon.