Currently none of this content is indexed, which is unfortunate since it is very keyword rich.
Currently you can set a private forum to show the threads, but not allow members to see content, however this would allow members to bypass the exchange area and just directly message the member.
Here is what I would like the add-on to do:
*Show thread titles to members
*Show the first post of threads when clicked on
*Hide all usernames of members on all pages for the related sections(instead of the username, simply display "unavailable" or something similar).
*Be able to select which forums this applies to in Admin CP
*Be able to select which user groups this applies to in Admin CP(unregistered users)
*Blur out/hide any additional posts and display a text box with customizable html text
*Should be a full add-on package that is able to be installed and uninstalled
I am willing to pay for this add-on. Please send me a PM with how much you are looking for to create this.