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This question already has an answer here:

I have noticed that it seems to be good etiquette to write the "at" sign and then the userid of the person whose post or comment one is responding to in a comment. I believe that's called pinging. I've tried to do this and sometimes it works, and sometimes it just disappears when I hit "Enter."

Am I supposed to ping? If so, are there some tricks to make it work more consistently? Or could someone at least explain the pattern to me?

marked as duplicate by Ro-Reinstate Monic-Alsop, Community Jul 28 '15 at 7:11

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If you are trying to ping the person who submitted the post you are commenting on, it will be deleted automatically as it is unnecessary. They will get a ping anyway. Similarly for those who have already commented on that post.

So save your pings for those who won't get auto-pinged.

Useful FAQ here.

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