Welcome to LessWrong old friend. :) The comments here have a karma system. Generally they get upvoted for seeming useful and downvoted for seeming useless. There is no moderation really, but if you lose more than three karma on a comment, it goes invisible unless someone chooses to read it by clicking the plus sign. It is a useful way to hone your debate/explanation skills. Also be sure to check out the yummy Sequences and learn to be more rational.