When a reply is made to a comment, a twitter notification (@twittername) will be sent to the original comment author to notify him/her of the reply. The notification will be sent from your Twitteraccount. 
This will allow the users to follow up on the comment and expand the conversation if desired.

CommentTweets

When a reply is made to a comment, a twitter notification (@twittername) will be sent to the original comment author to notify him/her of the reply.

mcalamelli

The BTCNew WordPress plugin finds conversations related to your content and allows you to display the associated comments inline with your own. Existing conversations about your content taking place across the web can now be displayed right on your blog for your visitors to read and respond to. It works on top of your existing WordPress comments, both threaded and non-threaded.
Currently, we support conversations from:
<ul>
<li>Twitter – tweets that link your posts</li>
<li>FriendFeed – on the entries for your posts</li>
<li>Digg – on the submissions for your posts</li>
<li>Reddit – on the submissions for your posts</li>
<li>Hacker News – on the submissions for your posts</li>
<li>Other blogs – whenever someone links one of your posts</li>
</ul>
The plugin is highly customizable. You can:
<ul>
<li>Specify which sources you want to include comments from</li>
<li>Add a summary to the top of your comments section, which shows the number of comments from each source</li>
<li>Specify whether you would like BackType Connect comments to be displayed at the end of the comments section, or mixed with the rest of your comments</li>
</ul>
This plugin was created using <a href="http://www.backtype.com/developers/connect" rel="nofollow ugc">BackType Connect</a>. 
This plugin is a fork of the old Backtype Connect WordPress plugin, developed by Backtype.
<h3>Support</h3>
If you’re having problems using our plugin, let me know. I’m happy to help! You can contact me through <a href="http://www.mcalamelli.net" rel="nofollow ugc">my website</a>.

BTCNew

The BTCNew Wordpress plugin lets you show related conversations (from Twitter, Digg, FriendFeed & more) inline with your own comments.

CommentTweets vs BTCNew