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.

Riyaz

GetSocial adds a lightweight and intelligent floating social media sharing box on your blog posts.
Features:
<ul>
<li>Floating social share box compatible with leading web browsers</li>
<li>Out-of-the-box functionality like
<ul>
<li>Twitter Tweet Button</li>
<li>Facebook Like and Share button</li>
<li>Google +1 Button</li>
<li>Buffer Button</li>
<li>Pinterest Button</li>
<li>LinkedIn Button</li>
<li>Stumbleupon Submit button</li>
<li>CentUp button</li>
<li>Your Own Button</li>
</ul>
</li>
<li>Easily add any number of additional social media sharing buttons</li>
<li>Re-order buttons with simple drag-and-drop</li>
<li>Hide individual share counts if desired</li>
<li>Resize GetSocial share bar width (useful for non-English blogs)</li>
<li>Always visible and accessible even if the user scrolls down the page</li>
<li>Auto-adjusts itself to all screen resolutions and window sizes</li>
<li>Automatically hides itself partially to the left of the screen if window is resized to smaller than defined width</li>
<li>Completely hides itself on tablets and mobile screens</li>
<li>Hovering over a partially hidden GetSocial box displays the full box</li>
<li>For higher screen resolutions, displays full by default</li>
<li>Easy-to-use Color Picker to customize the look and feel to match your blog theme</li>
<li>Lightweight plugin with minimal settings</li>
<li>Scripts are loaded in footer to improve page-load time</li>
</ul>
Be sure to check out: <a href="https://wordpress.org/extend/plugins/social-metrics/" title="Social Metrics Plugin" rel="ugc">Social Metrics</a> – Helps you track how your posts are shared in the social media.

GetSocial

GetSocial adds an intelligent, lightweight, quick to setup floating social media sharing box on your blog posts.

WordPress Social Login vs GetSocial