or download this
my $ua = new LWP::UserAgent;
my $req = new HTTP::Request 'POST','https://api.twitter.com/1/users/lo
+okup.json';
$req->content_type('application/x-www-form-urlencoded');
$req->content('user_id='.join(",",keys %missingusers));
my $res = $ua->request($req);