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In comments, it is possible to use @-references to get the attention of a user.

Which users can be referred using @ followed by the username?
Are there users that are automatically notified of a comment?
How do I notify a user with a username containing spaces?

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Which users can be referred using @ followed by the username?

The users that can be notified using a @-reference are:

  • In questions
    • any user who edited the question
    • the moderator who closed the question
    • any commenter who wrote a comment for the same question
  • In answers
    • any user who edited the answer
    • any commenter who wrote a comment for the same answer

Are there users that are automatically notified of a comment?

The users who are automatically notified of a new comment are:

  • the author of the post
  • in the case of comments between two users, the user who wrote the previous comment
  • if a user comments on their own post and there is only one person who has previously commented, then that person is also notified if @name is forgotten

How do I notify a user with a username containing spaces?

When the user name contains spaces, to get the user notified the username needs to be written without any spaces. This means, for example, that a user using this is a name with spaces as username will be notified with @thisisanamewithspaces.
Any single punctuation character following the name is ignored. This means that the following comments will notify name.

@name: This is a comment.

@name, This is a comment.

@name. This is a comment.

 

[Reference: This question on Meta Stack Overflow.]

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