It would be really fun to see who's reading your topics in a list in the topic, either with usernames or just as a counter on the side of the meta-description.
As, say, 10 different people have read/followed the topic it will get a bronze-marking, 50 people the topic gets a silver-marking, and 100 people a gold-marking. I think this would motivate more quality threads.
And if anyone were to break a rule or something in the thread the marking would either disappear completely or go down one step (this done by the prefects).
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