It's an interesting point in general -- in real communities, these sorts of reputational things do a lot of work: if you're a dick to my friend, I will take note of that, and treat you differently as a result.  The list you're describing could enable things like that, although at scale those sorts of forces tend to not work, or get weird.

So many interesting SN experiments that could be run!

elvismercury

Muting, blocking, downvoting?

I was thinking this after the introduction of the concept of unzaps. If the list of unzaps is public, then maybe people would think it twice before doing the unzap if it is not totally justified. 
I've been thinking about this more and it could prevent some autozapping spam if we can see some users always receiving zaps from certain accounts that are not active commenting for example.  This is specially important when you receive rewards for zapping early. 
The whole idea needs to be discussed at least.