When should you prefer finding modules (MetaCPAN), and when should you avoid it?

# Example of using MetaCPAN to find a Perl module
# For example, to find the "LWP::UserAgent" module you can search:

my $ua = LWP::UserAgent->new;
my $response = $ua->get('http://www.example.com/');

if ($response->is_success) {
    print $response->decoded_content;  # or whatever
} else {
    die $response->status_line;
}