kundi

Social Kundi is the most powerful, simple and elegant wordpress social sharing solution. It adds Facebook Open Graph meta tags to your blog and allows you to call simple function from you template files, which places sharing functions on your blog (Facebook, Twitter and Google + 1).
Unlike the other WordPress social-sharing plugins it requires minimal options to be set in order to work. It does not support social sites, which won’t have any effect on your site.
If you want to have a long list of time-consuming, unnecessary set of options with loads of other features to be set, such as setting social sharing sites, icon sizes, colors, positions and so on, then this plugin is not suitable for you. Social Kundi is intended for effective social sharing and it was carefully designed to be plain and simple.

Social Kundi

Elegant and simple social sharing solution for your blog. Supports Facebook, Twitter and Google+.

Mervin Praison

This plugin helps you add Google authorship markup to your WordPress site, allowing your Google Plus profile picture to appear in Google Search results.
Features: 
* Easy 4-step setup process 
* Multiple author support 
* Multisite compatible 
* Shortcode support

WP Google Authorship

Nice

Google Plus Profile Picture appear in Google Search. Very Easy to implement. Including Google authorship for multiple authors and multisite.

Social Kundi vs WP Google Authorship