Developer forum

Hi
I'm working on a project where we want the extranet-users to be able to set their weblogs (and forum threads) private.
Is there any paragraph template extender or similar that I can use to accomplish this?

I have tried the page template extender, but I need to create tags that works within the weblog- and forum-templates so that I can check for example if access is granted for current user and if true allow the content to be display.

Or perhaps you have a suggestion on some other method to accomplish to make DynamicWeb-modules private? The privacy-settings should mostly be group-based, ie. if a user click on a blog we want the page to dynamically check if the user are member to a group that are granted access to the blogID.

Kind regards
Tobias