Adding Comments to Content
Feedback from users is a vital part of any Web site. By allowing users to add comments, you ensure that users can give feedback, correct typographical errors, or otherwise discuss the content.
You can discuss almost any piece of content in Plone; folders and topics are the only exceptions.
You can enable discussions in one of two ways. First, the owner
of the content (otherwise known as the person who created it) turns on
the discussion feature by clicking the properties tab of the object and
selecting Enabled under the Allow Discussion on This Item header
the default option applies the
policy for that type of content as defined by the site
administrator;
Once discussions are enabled, click the Add Comment button to
discuss the content, which opens a form for adding the comment.
Enter the subject of the comment and the text of the comment.
The text is entered as plain text, so just type away as usual. Comments
don't go through any workflow, so comments show up as soon as they've
been added. Once a comment has been entered, it can be replied to,
forming a threaded list of comments on an item. Further, comments will
be entered in the catalog so they can be searched.
NOTE Administrators logged in as managers can remove any replies or entire threads. Disabling replies doesn't remove the comments; it just stops them being shown, so reenabling comments will show the existing comments again.

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