How do I set a category on my sub-site that DOES NOT show up in Buddypress feed?

Pretty much what it says in the title;

I'd like to have a series of bits that don't show up in the BuddyPress feed that I can post to my personal site.

Similar, how do I set it so that ONLY posts from a certain category go to the buddypress feed? (essentially, the other side of the coin)