Keeping user info private from other users

[Fox Mulder]

Over the last couple of years, I have been using vbulletin 3x to have private one-on-one dialogues between myself and my customers. I would set up forums to discuss specific topics and have used vbulletin's user permissions to stop each customer from seeing the forums of others. I have now upgraded to vbulletin 4 and want to do the same thing.

I also do not want my customers to be able to see the names or any other information about other customers who are registered under any circumstances: for example, I am NOT wanting them to be able to see the "Newest Member" . Trouble is...I can't remember how I acheived this in the version 3x. Did I edit some templates or something????

Anyway, can anyone suggest how I can easily restrict users from seeing the names or any other info users in vbulletin 4?

Thanks in advance!