mmm, you are right.

Follows just means "I am interested", doesn't mean "I trust in domain X", neither "I endorse".

And that's fine, as long as you don't use follows to derive something more than "Web Of Not Spam".

Clearly there is a line. If you follow child pornography, I'll deduce you are disgusting, but that's on the extreme.

For anything that has to do with value, I would just look at zaps.

Context specific lists? Better than trust attestations, but I doubt users will want to:

a) produce them and keep them updated

b) publish them publicly

I think we should not assume people to do things to help others altruistically. Sharing your friends list to help others find good people isn't going to be super popular I think. Zapping is different, because u help someone that has already given value to u, let's say the creator, and it's seamless.