Nothing complicated: Just paste the following code into your function.php file. Edit lines 4 and 5 according to your needs.
add_filter('user_contactmethods', 'my_user_contactmethods');
function my_user_contactmethods($user_contactmethods){
$user_contactmethods['twitter'] = 'Twitter Username';
$user_contactmethods['facebook'] = 'Facebook Username';
return $user_contactmethods;
}
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Thanks to TutsPlus for the cool tip!