Selecting Threads for RSS Feeds

[medicalforums]

This seems to be a strange request but here's why;

Am pulling feeds from my vB forums website into Twitter, Facebook, and Widgetbox. More often than not, there are members who are posting silly new threads (which I think is the case in any forum site), these threads get fed into those pages I listed above which is quite embarrassing and downgrading my public pages. They will be there even after I delete them because I believe once the thread is published it will immediately go to the RSS feed.

I don't want to moderate new threads because this will hinder visitors from freely posting.
I don't want to create a special "hidden" forum (with good threads copied in it) and then use its RSS feed because then clicks on those public pages will land onto the hidden forum.

Is there any way that I can choose (manually, not by filters) which threads to be included in an RSS feed which then I can send to my public pages?

Thanks