<?php
/*
Plugin Name: Facebook Post Debugger
Version: 0.1
Plugin URI: https://jamesdigioia.com/
Description: This plugin runs the bit.ly shortlink through the Facebook
debugger upon publishing.
Author: James DiGioia
Author URI: https://jamesdigioia.com/
*/

add_filter( 'publish_post', 'fb_debug_link' );

function fb_debug_link( $post ) {
  $short = wp_get_shortlink($post['id']);
  $url = 'https://graph.facebook.com/?id='.$short.'&scrape=true';
  wp_remote_post( $url );
}