1. Comments which improve the discussion, whether I agree or not. Usually these are longer informative posts or those giving a particularly interesting view on

1. Comments which improve the discussion, whether I agree or not. Usually these are longer informative posts or those giving a particularly interesting view on a subject. 2. Upvote comments which are correct - especially if someone is replying to me correcting (or clarifying) something I said. 3. Comments which make the point I was just typing in. So you have one "thankyou" case and two "signal boost". I've noticed that my positive posts usually receive a lot of upvotes and my biggest ratio'd posts are those which are correct and negative.