I disagree, it sounds complicated but it would really be 3 things:
• did someone in your WoT mute/mark as spam?
-1
• does someone in your WoT follow?
+1
• did someone in your WoT repost, like, or zap?
+1

Could literally be that simple. And all this info is basically being pulled together anyway. Spammers will naturally end up with negative scores very quickly. 
Likes or shares could defend against someone just being a tool and calling someone a spammer because they disagree with them. 
And new accounts/posts with no connection to your WoT won’t be hidden by default, they will simply have a score of 0/neutral. 

 Just for reference, I think this is literally only 1 additional data point to what Coracle is already doing with their little WoT score next to the name. And I’ve seen first hand how useful that thing is 

 The only thing is, you need to vet someone first before including them in your circle, or in someone else’s circle.

Perhaps create a filter that allows you to mute someone who is posting frequently in a short period, like 5 posts per minute over the last 10 minutes (user customizable). This way, it wouldn’t be a blanket block