Here is Coracle definition 

WoT (Web Of Trust) is one of the best ways to determine how trustworthy someone might be, based on your social graph.

In Coracle, this number is equal to how many people you follow that also follow a given person, minus how many people you follow who have muted this person. This allows you to see at a glance if someone is accepted in your network. This helps reduce spam, impostors, and objectionable content.

You can set a minimum web of trust score on your content settings page, which will automatically mute anyone with a lower score than your threshold. 

 So I can check WoT score in coracle? I haven't used it yet.  

 Yes  .. if you see your feed in coracle .. you will see a wot score next to every user note .. 

You can choose to filter your feed on wot score  .. for example if you filter it say for a wot score of 5 + , you wont see any spam from reply guy :-)  ..