<?php
/*
Plugin Name: sample code
Description: Adding things to open graph plugin
Version: 0.1
Author: Piyush Mishra
Author URI: http://www.piyushmishra.com/
License: GPL version 2 or later - http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*/

// Add an action to change the Open graph plugin's output with yours
add_action('open_graph_head_post','open_graph_extension_desc');

function open_graph_extension_desc()
{
	//grab an instance of the class
	$og= open_graph_instance();
	
	if( is_single() )//check if its single post to add excerpt
	{
		//keep in mind that the_excerpt will give out the continue reading or similar output at the end.
		$og->set_og_data('og:description',the_excerpt());
	}
	//uncomment below and add your page_id too
	//$og->set_og_data('og:page_id','0000');//replace 0000 with your page id
	//uncomment below and add your admins ids too
	//$og->set_og_data('fb:admins','0000'); //replace 0000 with your admin id(your numeric facebook id)
	
}

/*
Another implementation with pre type
please note: using set_og_type with open_graph_head_pre will be overridden while processing
add_action('open_graph_head_pre','open_graph_extension_hometype');

function open_graph_extension_hometype()
{
	//grab an instance of the class
	$og= open_graph_instance();
	//Set the default homepage type
	$og->set_home_type('website');
	//Set the default image of the site 
	$og->set_default_img('http://url/to/the/image');// I just noticed a bug and will fix it in this function in the class.

}
*/