some code :P

Not sure if you are interested in it (since this changes the behaviour a bit, even compared with the notes I found in the code), but I was reading the code and decided to try that approach (no idea about the implications and so on as usual ;)).

In any case, you may find useful the last commit:
https://github.com/emanuele45/PrivateTopic/commit/b06ec39404c6f744bac6cc0085ccd932c678866c
that hides private topics from the feeds too.

The code is not tested much, so it may be broken, the PR is more of less to let you know the code exists if you want to consider it. ;)