Index: follow.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/follow/follow.module,v
retrieving revision 1.1.2.14
diff -u -r1.1.2.14 follow.module
--- follow.module	6 Oct 2009 15:19:26 -0000	1.1.2.14
+++ follow.module	3 Nov 2009 16:22:33 -0000
@@ -395,7 +395,7 @@
  */
 function follow_url_validate($form) {
   $url = trim($form['#value']);
-  if($url && !preg_match("/^[a-zA-Z]+[:\/\/]+[A-Za-z0-9\-_]+\\.+[A-Za-z0-9\.\/%&=\?\-_]+$/i", $url)) {
+  if($url && !preg_match("/^[a-zA-Z]+[:\/\/]+[A-Za-z0-9\-_]+\\.+[A-Za-z0-9\@\.\/%&=\?\-_]+$/i", $url)) {
     form_error($form, t('The specified url is invalid.'));
   }
 }