add_filter( 'user_contactmethods', 'customize_contact_methods' );
function customize_contact_methods()
{
   $user_contactmethods = array(
      'user_facebook' => __( 'Facebook' ),
      'user_twitter' => __( 'Twitter' ),
      'user_googleplus' => __( 'Google+' ),
      'user_linkedin' => __( 'LinkedIN' )
   );
 
   return $user_contactmethods;
}