renemanqueros

Allows users to log in to WordPress using Google+ or Facebook. 
Adds a configuration panel under Settings where users can set API keys. 
Upon successful login, depending on the service, users will be redirected to either:
— www.mywebsite.com/facebookcallback/ 
— www.mywebsite.com/googlecallback/
<ul>
<li>Trailing slash is mandatory. 
After that the user will be sent to the destination url set in the Settings panel.</li>
</ul>
<h3>Theming</h3>
Both links have a common CSS class: “gp_sociallogin”. 
Google’s login link has a specific class: “google”. 
Facebook’s login link has a specific class: “facebook”.

GP social login

Allows users to log in to Wordpress using Google+ or Facebook.

mczolton

The Zolton.org Social Plugin (ZOSP) is a simple plugin for WordPress that 
integrates a blog with popular social networking sites such as Facebook and 
Twitter. I wrote this plugin to learn WordPress plugin development, and as a 
means to decouple these social networking features from my desired WordPress 
theme.
Features
<ul>
<li>Includes the Facebook JavaScript SDK in your WordPress theme.</li>
<li>Generates Facebook Open Graph tags for posts and pages.</li>
<li>Includes the Facebook Like Button and Send Button on posts and pages.</li>
<li>Imports the featured image / post thumbnail (if available) from a post or 
page for use as the featured image on Facebook.</li>
<li>Generates a Facebook Comment section for posts and pages.</li>
<li>Includes the Twitter Tweet Button on posts and pages.</li>
<li>Includes the Google +1 Button on posts and pages.</li>
<li>Includes the Pinterest Pin It Button on posts and pages.</li>
<li>Optionally hides WordPress comments.</li>
<li>Configurable via WordPress setting page.</li>
</ul>
Requirements
<ul>
<li>A Facebook App ID.</li>
<li>A Twitter account.</li>
<li>WordPress theme supporting featured images / post thumbnails.</li>
</ul>
<h3>Known Issues</h3>
<ul>
<li>“Leave a Comment” link is still visible when WordPress comments are disabled.</li>
</ul>

Zolton.org Social Plugin

A simple plugin for WordPress that integrates a blog with popular social networking sites such as Facebook and Twitter.

GP social login vs Zolton.org Social Plugin