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If only a post's author and one comment are having a conversation then any @ notifications between them are removed from the start of comments on the grounds they are considered noise because post owners are always notified of comments whether you @ them or not.

This will not happen if any other person is involved in that comment thread.

(For ref see http://meta.stackexchange.com/a/97290/147926 and http://meta.stackexchange.com/a/97099/147926 among probably others on MSO)

For the sake of completeness, I guess I should point to the How do comment @ replies work? FAQ post, in case you want more detailed information in general.

As a side note, comments that attempt to ping multiple users (ie, multiple @'s) are also blocked, the work around (backticks) will cause only the first @ to be notified.

If only a post's author and one comment are having a conversation then any @ notifications between them are removed from the start of comments on the grounds they are considered noise because post owners are always notified of comments whether you @ them or not.

This will not happen if any other person is involved in that comment thread.

(For ref see https://meta.stackexchange.com/a/97290/147926 and https://meta.stackexchange.com/a/97099/147926 among probably others on MSO)

For the sake of completeness, I guess I should point to the How do comment @ replies work? FAQ post, in case you want more detailed information in general.

As a side note, comments that attempt to ping multiple users (ie, multiple @'s) are also blocked, the work around (backticks) will cause only the first @ to be notified.

If only a post's author and one comment are having a conversation then any @ notifications between them are removed from the start of comments on the grounds they are considered noise because post owners are always notified of comments whether you @ them or not.

This will not happen if any other person is involved in that comment thread.

(For ref see http://meta.stackexchange.com/a/97290/147926 and http://meta.stackexchange.com/a/97099/147926 among probably others on MSO)

For the sake of completeness, I guess I should point to the How do comment @ replies work? FAQ post, in case you want more detailed information in general.

As a side note, comments that attempt to ping multiple users (ie, multiple @'s) are also blocked, the work around (backticks) will cause only the first @ to be notified.

If only a post's author and one comment are having a conversation then any @ notifications between them are removed from the start of comments on the grounds they are considered noise because post owners are always notified of comments whether you @ them or not.

This will not happen if any other person is involved in that comment thread.

(For ref see http://meta.stackexchange.com/a/97290/147926 and http://meta.stackexchange.com/a/97099/147926 among probably others on MSO)

For the sake of completeness, I guess I should point to the How do comment @ replies work? FAQ post, in case you want more detailed information in general.

As a side note, comments that attempt to ping multiple users (ie, multiple @'s) are also blocked, the work around (backticks) will cause only the first @ to be notified.

If only a post's author and one comment are having a conversation then any @ notifications between them are removed from the start of comments on the grounds they are considered noise because post owners are always notified of comments whether you @ them or not.

This will not happen if any other person is involved in that comment thread.

(For ref see http://meta.stackoverflow.com/a/97290/147926 and http://meta.stackoverflow.com/a/97099/147926 among probably others on MSO)

For the sake of completeness, I guess I should point to the How do comment @ replies work? FAQ post, in case you want more detailed information in general.

As a side note, comments that attempt to ping multiple users (ie, multiple @'s) are also blocked, the work around (backticks) will cause only the first @ to be notified.

If only a post's author and one comment are having a conversation then any @ notifications between them are removed from the start of comments on the grounds they are considered noise because post owners are always notified of comments whether you @ them or not.

This will not happen if any other person is involved in that comment thread.

(For ref see http://meta.stackexchange.com/a/97290/147926 and http://meta.stackexchange.com/a/97099/147926 among probably others on MSO)

For the sake of completeness, I guess I should point to the How do comment @ replies work? FAQ post, in case you want more detailed information in general.

As a side note, comments that attempt to ping multiple users (ie, multiple @'s) are also blocked, the work around (backticks) will cause only the first @ to be notified.