use YAML ();
my $config = YAML::LoadFile("$ENV{HOME}/.twitter.cnf");

# Where the file in question is only readable by the user-
cow@moo[1607]~>sl .twitter.cnf 
-rw-------   1 cow  staff  0 Jul  3 23:08 .twitter.cnf

# And the config file looks like (YAML) this-
---
username: MooseQueen
password: twitterLuser