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This plugin allows you to add authentication using social media networks (Twitter, WordPress, Google+, etc.) for the users who want to comment on your blog. 
The plugin can be activated to provide authentication for all posts or only for selected posts. 
The usage of this plugin does not oblige you to create an account on our website, like others plugins do. 
All you need is to have an account (if you don’t have one, then you must create it) on the social network that you want to use as a source of authentication.
<h3>Configuration</h3>
To configure the plugin, you must follow the instructions described here: http://www.ixtendo.com/comments-with-social-login-wp-plugin/

Comments with Social Login

Add authentication using social media networks (Twitter, WordPress, Google+, etc.) for blog comments

bradvin

<blockquote>
SocialWiggle documentation, FAQ and support can be found at <a href="http://fooplugins.com/plugins/socialwiggle-lite/" rel="nofollow ugc">FooPlugins.com</a>
</blockquote>
features
<ul>
<li>Choose from 10 social networks</li>
<li>Dead easy settings page including drag and drop ordering</li>
<li>3 tile styles : Metro, rounded or round</li>
<li>3 wiggle effects : random, on-page-load or on-hover</li>
<li>2 sizes : 64×64 or 32×32</li>
<li>Include it into your page using an easy to use Widget</li>
</ul>
Upgrade to <a href="http://fooplugins.com/plugins/socialwiggle-pro/" rel="nofollow ugc">SocialWiggle PRO</a> and also get
<ul>
<li>20 social networks</li>
<li>Editor button and shortcode generator</li>
<li>handy PHP function to include in your page templates</li>
<li>“Powered By” widget link removed</li>
<li>Priority Support</li>
</ul>

SocialWiggle

Display your social network profiles using catchy looking Metro tiles that wiggle to catch your visitor's attention

Comments with Social Login vs SocialWiggle