It should be encouraged to provide an explanation (in comments?) for downvotes
8960
Encouraging people to explain downvotes
22991
A way for "new users" to ask about their post specifically
51535
What's the justification for the commenting reputation requirement?
55293
What is desired practice for deriving answers from comments?
131405
Why was "downvoting comments" declined? Should this feature be revisited?
129535
If you bookmark a question, shouldn't you also be encouraged to upvote it?
5113
Should basic netiquette dictate that we post reasons for downvoting?
96873
Answers converted to comments should retain upvotes
105542
Allow flagging a comment after upvoting it
99174
Award extra points to answer?
153938
A Proposal for More Constructive Downvoting on Meta: Express Disagreement by Answering the Question
37221
I don't understand an answer. Should I add a comment, or post a new question?
15420
Why should I upvote a question?
51806
Make it cost more to downvote without comment; make it hurt to leave a crap comment
84848
Show Total Votes (or Up/Down Votes)
120140
What to do with an additional answer which IMHO explains only a small portion of the question, while another answer explains more
16146
Can we get x comment votes per y minutes, rather than one vote per 5 seconds?