Piyush Mishra

The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to enable any web page to have the same functionality as a Facebook Page.
While many different technologies and schemas exist and could be combined together, there isn’t a single technology which provides enough information to richly represent any web page within the social graph. The Open Graph protocol builds on these existing technologies and gives developers one thing to implement. Developer simplicity is a key goal of the Open Graph protocol which has informed many of the technical design decisions.
<h4>For Developers</h4>
Use <code>add_action('open_graph_head_pre','your_function');</code> and <code>add_action('open_graph_head_post','your_function');</code> to edit the meta data. For an instance of the class.
Always use <code>open_graph_instance()</code> 
Read more on the Plugin URI > <a href="http://www.piyushmishra.com/plugins/open-graph.html" title="Plugin URI" rel="nofollow ugc">Open Graph WP implementation</a> or check out the FAQs

Open Graph WP implementation

Implements the Open Graph Protocol on a WordPress installation. Can be used by other plugins as a dependency.

thewarlog

KLK1

Rashid Azar

To attract people from google, twitter and facebook by adding like button. 
This plugin lets you dramatically increase your traffic.
To put it simple, it automatically publishes each new post of your blog to the Facebook newsfeed of your readers and to the feed of readers from similar blogs.
What’s so cool about that? It notifies people around the globe who are interested specifically by the subject of your new blog posts. It does it in a very simple and compelling way, which brings additional traffic to your blog.

RA-Socialize Button

RA-Socialize Button adds a Google+, twitter and facebook button to your blog post.

Open Graph WP implementation vs RA-Socialize Button