I noticed this behavior. Is it new?

In question Q:

user A posts an answer, then

user B posts a comment under the answer of A, then

user A posts $n$ additional comments without an @B ping, then

user B receives inbox notification of $n$ comments in question Q.

I observed this as user B. The comments of A were not edited, so that the visible comment text is the original and one can see that it never contained an @B ping, or the username of B, or quoted text or shared keywords from the comments of B, that might have generated an automatic notice.

Does the software auto-notify when the comment discussion involves only two users, or only one user other than the answerer?

  • $\begingroup$ I just located the answer, I guess it is better to leave the question up, but can delete the Q and the A if that is the local procedure. $\endgroup$
    – zyx
    Nov 21, 2011 at 23:54
  • $\begingroup$ It's fine to leave it here, I think. You can even accept your answer a little later! $\endgroup$ Nov 22, 2011 at 1:12
  • $\begingroup$ Further info and links on how the notification system works can be found in Hendrik Vogt's answer here. $\endgroup$
    – t.b.
    Nov 22, 2011 at 1:52

1 Answer 1


The answer is yes.

The needle in the 50-question haystack (the intersection of [comments] and [notifications] on meta.stackoverflow) is a link inside one of those questions:

Micro-refinement to notifications for comments of others posts

where this suggestion was marked as implemented on March 8, 2011:

If a user comments on their own post and there is only one person who has previously commented, then that person should be notified when the author comments even if '@user' is not specified

  • 1
    $\begingroup$ The linked post appears in the stackoverflow meta in a third category, [comment-replies], which is smaller than [comment] but not a subset. $\endgroup$
    – zyx
    Nov 22, 2011 at 5:54

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