I'll post a picture to get a little clearer, see below:
http://projetos.cajucomunicacao.com.br/users.png
The image to the left shows the profile of the User offline, a message that was not found any articles that user appears.
The right image shows the profile of the logged in User, oh yes he brings the articles that user, only that if I enter any other profile it always returns the items and not the logged in user's user profile accessed.
I understand that this is due to the configuration of my list that is in the picture below, as you can see I've set follows the "Article Created By" field put the "Live" as "User" and set its value as "id".
What I understand he seeks "$user->get ('id')" joomla then you need to be logged so that the results are displayed, I believe I would have to put "user_id" instead of "$ user->get ('id') "but when I put the" user_id "it always returns me all articles to all users.