The recent implementation of a -5 karma penalty for replying to comments that are at -3 or below has clearly met with some disagreement and controversy. See http://lesswrong.com/r/discussion/lw/eb9/meta_karma_for_last_30_days/7aon . However, at the same time, it seems that Eliezer's observation that trolling and related problems have over time gotten worse here may be correct. It may be that this an inevitable consequence of growth, but it may be that it can be handled or reduced with some solution or set of solutions. I'm starting this discussion thread for people to propose possible solutions. To minimize anchoring bias and related problems, I'm not going to include my ideas in this header but in a comment below. People should think about the problem before reading proposed solutions (again to minimize anchoring issues).
That's about right. Also, stick to high traffic threads. Hit the HPMOR threads hard!
As I pointed out that people want different things out of the list, you finish by pointing out that the karma votes themselves are clearly used differently by different people. They're also used to a different extent by different people.
One nice thing that Slashdot does is limit your karma votes. That keeps individual Karma Kops from have a disproportionate effect on total score. But I don't think the Slashdot system of multiple scores is that helpful.
From my experience in the grand old days of Usenet, the most useful filters were on people, and the important ease of use features were a single screen view of all threads, expand and contract, sort by date or thread, and sort by date for a subset of threads.