saaa

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

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.

Comments with Social Login vs ShareMe