WordPress remove old contact methods, add Twitter

gistfile1.php

// Remove obsolete user contact info and add new
function dmc_new_contactmethods( $contactmethods ) {

// Remove these
unset($contactmethods['aim']);
unset($contactmethods['yim']);
unset($contactmethods['jabber']);

// Add Twitter
$contactmethods['twitter'] = 'Twitter';

    return $contactmethods;
}
add_filter( 'user_contactmethods', 'dmc_new_contactmethods',10,1 );