[Jetpack] Verify your site with Facebook by adding an admin meta tag to the head of your site. Works when Jetpack is enabled. http://i.wpne.ws/WiUs

plugin.php

<?php
/*
 * Plugin Name: Verify your site with Facebook
 * Plugin URI: http://wordpress.org/plugins
 * Description: Verify your site with Facebook by adding an admin meta tag to the head of your site. Works when Jetpack is enabled.
 * Author: Jeremy Herve
 * Version: 1.0
 * Author URI: http://jeremy.hu
 * License: GPL2+
 */

/*
 * Force Jetpack to display Open Graph meta tags
 * Even when they have been disabled by another plugin
 */
add_filter( 'jetpack_enable_open_graph', '__return_true', 100 );

/*
 * Add Facebook Admin meta tag to the head
 * To find your Facebook ID, visit this page
 * http://findmyfacebookid.com/
  *
  * Facebook Admin tag docs are available here:
  * https://developers.facebook.com/docs/insights
 */
function jeherve_fb_admin( $tags ) {
    $fb_admin = '611546862'; // Paste your own Facebook ID here
    $tags['fb:admins'] = absint( $fb_admin );

    return $tags;
}
add_filter( 'jetpack_open_graph_tags', 'jeherve_fb_admin' );