Thank you. One of the implicit assumptions of user-generated content sites is that every user should be given a voice. Unfortunately, this creates feedback loops around certain topics (around here, it tends to be Linux/C/vim) because there are too many benefits attached to discussing those topics; namely, karma and [illusory?] in-group status.

One idea is to give each user only a finite number of comments they can make in a time period. As their karma increases, so does their comment allotment.