FB Script

//FACEBOOK
function insert_facebook_likes_custom_field($post_ID) {
        global $wpdb;
        if(!wp_is_post_revision($post_ID)) {
            add_post_meta($post_ID, 'fb_likes_count', '0', true);
        }
    }

add_action('publish_page', 'insert_facebook_likes_custom_field');
add_action('publish_post', 'insert_facebook_likes_custom_field');

add_action( 'fb_hourly_count', 'do_this_hourly' );
add_action( 'wp', 'fb_activation' );

function do_this_hourly() {

        $args=array(
        'post_type' => 'post',
            'post_mime_type'   => '',
            'post_status'      => 'publish'
        );
        $posts_array = get_posts( $args );

    foreach($posts_array as $post):

        $permalink = get_permalink($post->ID);

        $idpost = $post->ID;

        $data = file_get_contents('http://graph.facebook.com/?id='.$permalink);

        $json = $data;

        $obj = json_decode($json);

        $like_no = $obj->{'shares'};

        $meta_values = get_post_meta($idpost, 'fb_likes_count', true);

        if($like_no == null){$like_no = 0;}

        update_post_meta($idpost, 'fb_likes_count', $like_no, false);

    endforeach;

}

add_action('init', 'do_this_hourly');

 function fb_activation() {
    if ( !wp_next_scheduled( 'fb_hourly_count' ) ) {
        wp_schedule_event( time(), 'hourly', 'fb_hourly_count' );
    }
 }
     /* End of fb like count management */

// END FACEBOOK