How to get latest $post_id from multi post types

Hello,

I’m trying to synchronize my latest post to local social network. The code I searched from internet could synchronize the latest post from default post type “post” only. However, I still have other 3 custom post types, let we say “experience”, “deal”, “value”. I believe there should be some code to be added at the beginning, but I don’t know how to do.
Could somebody help, thank you!

if(get_post_meta($post_ID,'weibo_sync',true) == 1) return;
   $get_post_info = get_post($post_ID);
   $get_post_centent = get_post($post_ID)->post_content;
   $get_post_title = get_post($post_ID)->post_title;
   if ($get_post_info->post_status == 'publish' && $_POST['original_post_status'] != 'publish') {
       $appkey=''; /*  */
       $username='';
       $userpassword='';
     $request = new WP_Http;
	 $keywords = ""; 

       /* get the thumbnail picture */
       $url = get_mypost_thumbnail($post_ID);

       /* if success, add weibo_sync to avoid the post re-sync to weibo again when update */
       add_post_meta($post_ID, 'weibo_sync', 1, true);
    }
}
add_action('publish_post', 'post_to_sina_weibo', 0);