We have recently enabled a Reputation.
You will notice when somebody posts Underneath their details on the left is a small image button (
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Which when clicked it opens a new page asking you if you will Approve or Disapprove their posts. By approving it gives them a good reputation. And later on in the future when you see they have a good reputation you are more likely to trust them.
By disapproving you are decreasing their rep. which wont go down very well but its your decision.
We hope this Reputation Moderation helps you guys on your way