The solution to that is to set a threshold so X number of members have to click the spam button before the post disappears and the poster is quarantined. If you set X to 10 or so, it would be hard for abusers to improperly flag a post, but legitimate spammers would still disappear quickly.
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One site that I frequent uses a category called "trusted users". I'm not sure what their criteria is, they keep that private. Trusted users can troll rate a post.
Other TUs can see that there's a hidden troll rated post in the thread and view it if they wish. That means that there is a potential for questioning a bad call.
You might want to talk to the software designers to see if they can add a feature to deal with the spam problem.
