On desktop SE, I can type @ and the usernames that I can ping will be suggested. It's known that pinging the OP as the only commenter, or pinging the author of an answer as the only commenter, will strip the @ping.

On mobile SE, it is not really possible to ping a user in comments, which is very annoying to me since I way prefer the mobile site over the mobile app.

However, a few times in the past few days I have tried to ping a commenter from the mobile site, just by typing their name. For instance, if the user's name is RikerW, I typed @rikerw blah blah.

Those pings didn't get replies from active users. We also know that @pings are just text, not special entities like on Facebook, which is why they are not updated with usernames. (see Change all @username references in comments when a user changes their name?)

What causes a ping? How do comment @replies work? says "reasonable match", but what is that?

  • Must I type the @ and select one of the options with TAB, or
  • can I just type the user's name?
  • Does case matter?
  • Is it possible to ping from the mobile site?
  • Mobile web just don't have auto complete. If you type it manually (like everyone did before auto complete existed) the ping works just fine. Mar 5, 2016 at 17:15
  • 1
    @sha is this really a duplicate? I didn't see this question as a feature request, but as a support question. Mar 5, 2016 at 17:20
  • @Pat this is a corner case in my opinion. The root cause of the OP's confusion is that there is no auto complete for comment replies in mobile web Mar 5, 2016 at 17:46

1 Answer 1


To ping a user you should start with @. For my name @pat is sufficient.


  • Always start with the @ symbol;
  • Names are not matched case sensitive. No leave out spaces though;
  • You don't need the full name or use the tab key to 'select' a name, three letters are enough to ping a user;
  • It does work perfectly from the mobile site, it just lacks auto-complete on the name.
  • 1
    Thank you! The supposed duplicate didn't answer these
    – cat
    Mar 5, 2016 at 17:27

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