Louy Alakkad

GeePress, gives you all the tools you need to integrate your WordPress and Google+, including “Login with Google+” and “Comment via Google+”… Highly customizable and easy to use.
<h4>Key Features</h4>
<ul>
<li>Allow your visitors to comment using their Google+ accounts</li>
<li>Allow your blog users to sign in with their Google+ accounts. one click signin!</li>
<li>Easily customizable by theme authors.</li>
</ul>

GP – GeePress

All the tools you need to integrate your WordPress and Google+.

eppand

This plugin will add a configurable widget to display social media icons in your widget area(s). Icons are 32×32, squared edges, and display inline.
Supported social media links include:
<ul>
<li>Twitter</li>
<li>Facebook</li>
<li>Google+</li>
<li>LinkedIn</li>
<li>YouTube</li>
<li>Pinterest</li>
<li>RSS</li>
</ul>
Available Languages
<ul>
<li>English (en_US)</li>
<li>Serbo-Croatian (sr_RS) – Borisa Djuraskovic at (http://www.webhostinghub.com/)</li>
</ul>
UPGRADE NOTICE
A change has been made to the social profile links if you are upgrading this plugin from a version prior to 1.0. The Social Media URLs are managed from a new area in the WordPress admin and will require you to enter your URLs again.

SimpleConnectWidget

This plugin will add a configurable widget to display social media icons in your widget area(s). Icons are 32x32, squared edges, and display inline.

GP – GeePress vs SimpleConnectWidget