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.

tarek.chida

Share-me is a simple social share plugin. 
Share your posts on multiple Social Networks with different icons sets. 
Share-me is able to deal with new icons sets added. 
No ads no sniffing scripts… just a simple and a clean way to share posts! and its Responsive 🙂
You can choose : 
Horizontal position Left/Right 
Vertical position Before/After post 
Icons size 16 px / 20 px / 32 px
Included social Networks : 
Facebook 
Twitter 
Googleplus 
Tumblr 
Linkedin 
Blogger
 New : You can share post using mail
Included Icon Sets : 
Apricum 
Cercle 
Elegent 
Leaf 
Minimalist 
Ribbon 
Simple 
Square 
Shaded

ShareMe

Share-me is a simple social share plugin.

WordPress Social Login vs ShareMe