Web based commenting system. Embed directly in to your site
Comments are very important for a blog or website to get feedback from their users. Comments could be threaded where users could be discuss and post reply to the comment. Here we going discuss about the most popular and widely used free commenting system. You need to embed their javascript code in your every page and it will take care the rest of the task.
Disqus is the best commenting system with loads of feature.
- Comments become more like live discussions with realtime posting and updating.
- Reply to the comments (Threaded comments)
- All Comments are notified to the admin via Email
- Full integration with media services such as Youtube, Flickr, and more. Attach media such as photos and videos right within the comments.
- Fully compatible with mobile websites for commenting while on the go.
- Full integration with Facebook, Twitter to login and comment
- Community box gives everyone a summary view of the activity and people participating on the site.
- Admin has full privilege to moderate the comments.
- Spam protection available.
- Comments could be posted to Facebook and Twiter
- Drupal, Wordpress, and other CMS has plug-in to use Disquss
- It has API support.

IntenseDebate is a feature-rich comment system for WordPress, Blogger, Tumblr and many other blogging/CMS platforms.
It has lot more features.
- Threaded comments
- Respond to and moderate comments with ease via email
- Commenters receive email alerts when a response to their comment is posted, linking them directly to the response.
- Commenter profiles let you and your readers learn more about each other.
- Comments are Commenters are moderated based on IP Address and Email.
- Reputation Points & Comment Voting. Bring the quality comments to the forefront
- readers can post comments easily using their OpenID
- Widgets to display comments stats, most recent comments etc
- Rss support - read and post comments directly from your RSS reader
- Comments could be posted to Facebook and Twiter
- It has API support.

Instacomment is Simple and Instant commenting system. It requires PHP support. Instacomment will provide a PHP file which needs to uploaded to the server. Later javascript code be embedded in every page. It has following features.
- Users could Create, Quote, Edit or Report Comments
- Read new comments via RSS feeds
- Comments are posted instantly via Ajax
- Admin could moderate the comments.
- All Comments are notified to the admin via Email
- Ban users based on username or IP address

Conclusion: If you are using PHP and require simple commenting system then choose Instacomment else choose between Disqus or IntenseDebate. While building this site, I thought to write my own commenting system then tried Disqus and it worked great. It reduced my development effort.
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