"Comment Notifications" in Business Edition? How does it work?

Question

1C-Bitrix

Good afternoon!
Prompt, analyzing the editorial office of Business, I saw such a thing - Notification of a comment, refers to the Social Network.
But I can't see how it works, I can't get it to display comments.
They write around how it all works on Bitrix24, but there is no word about BUS. Please tell me how to set it up.
Component output:

$APPLICATION->IncludeComponent(
  "bitrix:socialnetwork.blog.post.comment.mail",
  "",
Array(
    "AVATAR_SIZE_COMMENT" => "42",
    "COMMENT_ID" => "{#COMMENT_ID#}",
    "EMAIL_TO" => "{#EMAIL_TO#}",
    "POST_ID" => "{#POST_ID#}",
    "RECIPIENT_ID" => "{#RECIPIENT_ID#}",
    "URL" => "{#URL#}"

And tell me where does the mail template?
Thank you.