Miled

WordPress Social Login allow your website readers and customers to register on using their existing social accounts IDs, eliminating the need to fill out registration forms and remember usernames and passwords.
WordPress Social Login also allow you to import users contact list from Google Gmail, Facebook, Windows Live and LinkedIn.
WordPress Social Login gives you absolute control over users access to your website and comes a list of rules and restrictions for you to setup.
Easy to customize and integrate 
Wordpress Social Login come with a simple but flexible and fully customizable authentication widget. And if you are a developer or designer then you can customize it to your heart’s content.
Wide variety of providers 
Depending on the audience you’re targeting, you can choose from a wide variety of providers and services including: Social networks, Microblogging platforms, Professional networks, Media, Photo sharing, Programmers and Gamers networks.
Currently supported providers 
Facebook, Google, Twitter, Windows Live, Yahoo!, LinkedIn, Reddit, Disqus, Tumblr, Stackoverflow, GitHub, Dribbble, Instagram, 500px, Foursquare, Steam, Twitch.tv, Mixi, Vkontakte, Mail.ru, Yandex, Odnoklassniki, Goodreads, Skyrock, Last.fm, AOL and PixelPin.
Free, unlimited and white-label 
Wordpress Social Login is open-source and completely free. The source code is publicly available on <a href="https://github.com/hybridauth/WordPress-Social-Login" rel="nofollow ugc">GitHub</a> for anyone to help and contribute. You are free to use a WordPress Social Login in commercial projects as long as the copyright header is left intact.
Big thanks to everyone who have contributed to WordPress Social Login by submitting Patches, Ideas, Reviews and by Helping in the support forum.

WordPress Social Login

WordPress Social Login allow your visitors to comment and login with social networks such as Twitter, Facebook, Google, Yahoo and more.

Sam Hotchkiss

This plugin was built by the Maine WordPress Meetup group to make it really easy to add social network icons to your posts.
<h3>This plugin supports the following social networks:</h3>
<ul>
<li>Facebook</li>
<li>Twitter</li>
<li>LinkedIn</li>
<li>StumbleUpon</li>
<li>Delicious</li>
<li>Digg</li>
<li>Reddit</li>
<li>Designfloat</li>
</ul>
You can set this to display at the top or bottom of posts, or display it through a template tag:
<pre><code> socnet_display_links($post_id); 
</code></pre>
Note that the post_id is optional, it will default to the current post.

Simple Socnets

This plugin was built by the Maine WordPress Meetup group to make it really easy to add social network icons to your posts.

WordPress Social Login vs Simple Socnets