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Re:Ask HN: (Yet Another) HN Comment Quality Going Down? by ableal on Wednesday March 17, 2010 @06:33AM (#1198239)
Two suggestions: make votes cost (e.g. 1/10 point); put a threshold also on upvoting (e.g. 10 or 20 points).

Eroding over time (e.g. 1 pt/day) probably would also be beneficial.

Re:Ask HN: (Yet Another) HN Comment Quality Going Down? by csomar on Wednesday March 17, 2010 @09:53AM (#1198531)
I think threshold are useless in HN, since submission Karma and Comment Karma are mixed. Send two good stories that you steal from Reddit or track a popular blog and you'll get 100+ points quickly.