How do I restrict viewing of classifieds to members of a group or specific friends of a member?

I want to start a sharing site for my friends of all the stuff we have in abundance :slight_smile:
I've installed the classified plug-in on top of buddypress and now I'm looking for a way to restrict viewing of ads to groups and/or friends, that the member selects. Perhaps the private ad category - which I cannot find any field that refers to anywhere - can be used ?
Thanks !