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@ Mentions
Allow commenters to mention other users in their comments
@ Mentions Admin Screenshot
Enabling @ Mentions in the comment section allows others to mention people in their comments.
@ Mentions is in Beta: This feature has a lot of moving parts and it was decided to release the feature while it is still working out the finer details.
Mention someone in the comments
In addition, people who leave comments can opt-in to receiving notifications if someone has mentioned them in a comment.
Opt-in is Site-wide: When a user opts-in, they are sent an email to confirm their subscription. This enables comment mentions for the user site-wide.