From search, I found this about issue, however it is about saying "thank you" for an answer.

Time to time, I receive great comment response to my comment: first one and second one

For the first one, I just vote up and wish leave a response so for the second one I left a comment.

I am not sure both action as the comments can not be down voted, it seems either I am disagree or silent.

Is it good practice leaving comment saying "That's great comment" for the great comments, especially which calling me by @mog ?

  • This is a great comment. – Benjol Apr 5 '12 at 7:56

No, it is not. If one appreciates the comment and wants to show it, they can vote it up via the arrow to the left of the comment:

great comment

The tooltip even says "this is a great comment".

Putting another comment just to say "your comment" was great is noise and should be flagged as "not constructive / off-topic" or "chatty" (or if you want, something custom, but the first two reasons mentioned are sufficient):

flagging a comment

  • 6
    Nice answer, +1 – BoltClock's a Unicorn Apr 4 '12 at 17:56
  • 3
    @BoltClock: Sheesh. – Robert Harvey Apr 4 '12 at 17:56
  • Who exactly is this Mr E. User you speak of? – Lix Apr 4 '12 at 18:10
  • 2
    @Lix I hacked the HTML using Chrome's dev tools to create the mock up. I do that normally so there's never a direct link to any real content if something specific isn't being talked about. That way people don't think I'm picking on them. – casperOne Apr 4 '12 at 18:12
  • I really want to say to you that that was a great comment... But I won't since it directly contradicts your post. – Lix Apr 4 '12 at 18:58


Comments are for clarification of a post, not chatty conversation. They have no other sanctioned purpose, other than to keep "necessary noise" out of questions and answers.

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