Auto update Facebook OG cache on Wordpress post save

wp_facebook_cache_update.php

<?php
function facebook_cache_update( $post_id ) {
	// If this is just a revision, don't update
	if ( wp_is_post_revision( $post_id ) )
		return;

	$url="https://graph.facebook.com/";
	$post_url = get_permalink( $post_id );

	$response = wp_remote_post( $url, array(
		'method' => 'POST',
		'timeout' => 45,
		'redirection' => 5,
		'httpversion' => '1.0',
		'blocking' => true,
		'headers' => array(),
		'body' => array( 'id' => $post_url, 'scrape' => 'true' ),
		'cookies' => array()
		)
	);
}
add_action( 'save_post', 'facebook_cache_update' );
?>