Here is a Perl application which add all your friends birth dates in your Google calendar:
run it like this:
perl facebook_gcal.pl --google_user yourgoogleaccount
some features still need improvement like make events recurrence. now it just add all birth dates in 2010. you can change it if you like :)
*The script need following modules:
Net::Google::Calendar;
Time::Event::Recurrence;
Data::ICal::Entry::Event;
DateTime::Format::ICal;
WWW::Facebook::API;
Getopt::Long;
Data::Dumper;
Date::Manip;
install them with this command:
cpan -i MODULENAME
