>making downvotes costly seems like a good system Habr.com makes both up and downvotes costly, and they have an evolved system checks and balances. The best I´

>making downvotes costly seems like a good system Habr.com makes both up and downvotes costly, and they have an evolved system checks and balances. The best I´ve seen. They can even fight off Kremlin bots successfully, this is major feat in their region/language of choice.