It had its own moderation problems, but I liked the Slashdot rule that funny upvotes didn't count for karma with the explanation that "you have to be smart, not

It had its own moderation problems, but I liked the Slashdot rule that funny upvotes didn't count for karma with the explanation that "you have to be smart, not just a smartass". It made it so that people could still post jokes, but they weren't rewarded in the same way that meaningful contributions were.