In a community wiki, lots of people contribute by editing the post. So when a comment is done on the post, who gets the notification? All the contributors till date or the latest contributor? Or none?
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So without any @-names in the comment, only the first author - that is, the person who created the post - will be notified. Other authors (editors) can be notified by adding @name to the comment (where name is the username of the editor with spaces removed).
These rules are the same for CW and normal posts, though it can be more worth your while to look up the editor responsible for the portion being commented on in the revision history for CW posts.
Lets find out, edit me at will, comment away. Editing to see what happens!!! Re-edited, just to make sure