Dimario, That's not very good idea. If you do like that, so you can lost compatibility with latest versions, because of adding new field in the base.
So, we can do nest way...
Create new table `users_watch`
with second fields `id`, `anketa`, `user_id`
and after each view we write
if($id)
mysql_query("insert into `user_watch` set `anketa`='".$id."', `user_id`='".$user_id."' ");
than we able to show all those viewers...
Just because i write from phone, i can't write each step, but may be anybody can do