Looks to me as if it is a local issue with your perl installation (maybe ActivePerl?).
I gave it a try with my self compiled perl and got:
$ perldoc -l IO::Socket IO::socket CGI
No documentation found for "IO::socket".
$ perl -MIO::socket -e1
Can't locate IO/socket.pm in @INC (@INC contains: /usr/local/lib/perl5
+/5.10.1/i686-linux /usr/local/lib/perl5/5.10.1 /usr/local/lib/perl5/s
+ite_perl/5.10.1/i686-linux /usr/local/lib/perl5/site_perl/5.10.1 .).
BEGIN failed--compilation aborted.
(I added CGI to test if multiple arguments are OK)
As I currently don't have an ActivePerl at hand, I cannot test furthermore.
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