Guest Account
From HAA Best Practices Wiki
The template includes a plugin for Community Builder that allows you to suppress the display of one user on all of the lists generated by the system. This lets you create a guest account that doesn't show up in the user listing or on the where we live map.
If you want to use this feature you should register a user with whatever user name, user id and password you like. You should also set the "on the map" field for the new user to 'N'.
Once you've created the guest user, go to Joomla->Components->Community Builder->Plugin Management and click on 'HAAGuest'. On the right hand side of the screen you will see a box for the "Guest user ID", simply type the user id that you used in that box and press "save".