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

BuddyDev

Brajesh Singh

Anu Sharma

BuddyPress Poke

BuddyPress Poke Plugin allow members to poke users just like facebook.

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 ! ;)



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