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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

ShindiriStudio

SoGrid is a WordPress plugin that displays your social network posts / feed in a functional grid.
Each post type has full functionality of its native social network. Social Grid generates a shortcode and it allows you to place SoGrid anywhere on your website.
Simply copy and paste the shortcode directly to your webpage.
At this point, SoGrid supports 10 top social networks:
<ul>
<li>Facebook</li>
<li>Google+</li>
<li>Pinterest</li>
<li>Twitter</li>
<li>Tumblr</li>
<li>Flickr</li>
<li>Instagram</li>
<li>Dribbble</li>
<li>YouTube</li>
<li>VKontakte</li>
</ul>
We will constantly add more networks and continue to improve the existing ones with more features and design options.

SoGrid Lite

SoGrid is a WordPress plugin that displays your social network posts / feed in a functional grid.

Comments with Social Login vs SoGrid Lite