nickgrossman

Enable commenting on your posts via Twitter.
Posts will get a “Discuss on Twitter” button, which will prompt visitors to reply to the original tweet about the post, as well as a “View Discussions” button which will link to existing tweets about the post.
Each new post will be auto-tweeted (requires the <a href="https://wordpress.org/plugins/wp-to-twitter/" rel="ugc">WP to Twitter</a> plugin and a <a href="https://developer.twitter.com/" rel="nofollow ugc">Twitter Developer account</a>).

Discuss on Twitter

Willy Bahuaud

“Mention comment’s authors” is a plugin that improves the WordPress comments fonctionality, adding a response system between authors. 
When adding a comment, your readers can directly mentioning the author of another comment, like facebook or twitter do,using the “@” symbol.
This mention plugin add two features :
<ul>
<li>In the comments field, when an user entered the “@” symbol, it allows, through an autocompletion system, to quote (or poke) a preceding commentator.</li>
<li>Once comments validated, the mentioned names take the appearance of buttons. When the user clicks on it, window scrolls to the preceding comment from the person named. A class is added to it, for temporarily customize it in CSS.</li>
</ul>
This WordPress plugin is based on <a href="https://github.com/tactivos/jquery-sew" rel="nofollow ugc">“jquery-sew” jQuery plugin</a>, by <a href="https://mural.ly/" rel="nofollow ugc">mural.ly</a>.
You can find more information on this post : <a href="http://wabeo.fr/blog/systeme-reponse-commentaires/" rel="nofollow ugc">wabeo : Un système de réponse dans les commentaires</a>

Mention comment's Authors by Wabeo

Helpfull to avoid nested comments and perfect for your SEO (I managed to remove a large number of useless links in my comments thanks to this plugin).
Bonus : A one-click setup ! ;)



Great tool

When adding a comment, your users can directly mentioning the author of another comment, like facebook or twitter do,using the "@" symbol.

Discuss on Twitter vs Mention comment's Authors by Wabeo