Drupal Comment

Drupal provides a comment module in core that allows users to comment on any content type.

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Read more about the Drupal Comment module at http://drupal.org/node/23703

When enabled, the Drupal comment module creates a discussion board for each Drupal node. Users can post comments to discuss a forum topic, weblog post, story, collaborative book page, etc. An administrator can give comment permissions to user groups, and users can (optionally) edit their last comment, assuming no others have been posted since.