Community : Building Community With Comments

Drupal not only contains many comment related features but also settings for each content type contained within your Drupal install. So you can have different comment settings for blog posts and pages for example. The screenshots below show the standard comment settings for Drupal.

Comment Settings
The standard comment settings contain many options to help you customize the experience for your users. You dcomments can be  threaded discussions or flat. When comments are flat each comment always appears after the previous one. Threaded discussion allow users to reply to specific comments and those replies are grouped together.

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Courtesy : http://learnbythedrop.com