andeggs

ProSocial is a free WordPress plugin which connects your readers with your authors.
It shows an attractive pop-up bar next to your authors’ names, with links to their social media accounts.
On multi-author blogs, it’s a great way of encouraging your readers to connect with your authors on other social networks.
See it in action here: http://digitalshift.me/prosocial/
Features:
<ul>
<li>40+ social networks: You choose which networks to display. Your authors can add then their accounts themselves.</li>
<li>Includes email: Show your authors’ email addresses as well (with a captcha form to prevent spam).</li>
<li>Google Analytics: If you use Google Analytics, you can see who’s clicking on what.</li>
</ul>

ProSocial

ProSocial shows a pop-up bar next to your authors' names, with links to their social media accounts.

Artberri

When someone comments on your blog and writes a comment with his/her URL, is leaving more information than you think. This plugin displays web pages and profiles of those users in the dashboard, so you can add them as friends if you are in the same social network.
This is possible thanks to the Google Social Graph API. The profiles are showed because the commenter claims them as its owner on his web linking them with <code>rel="me"</code>. The ones which are with italic font are not reliable and they could not be of the user.
Comments, questions and bug reports are welcome: <a href="http://www.berriart.com/meet-your-commenters/" title="Meet Your Commenters" rel="nofollow ugc">http://www.berriart.com/meet-your-commenters/</a>

Meet Your Commenters

Displays web pages and social networks' profiles of your commenters in the dashboard.

ProSocial vs Meet Your Commenters