<em>userreference</em>, which creates custom references to your sites' user accounts. By adding a <em>userreference</em> field, you can create complex relationships between your site's users and posts. To track user involvement in a post beyond Drupal's standard <em>Authored by</em> field, for instance, add a <em>userreference</em> field named "Edited by" to a content type to store a link to an editor's user account page.