Force Publicize's post editor settings to expand.

functions.php

<?php // do not include in an existing PHP file or you can upload this entire file as a plugin.
/*
 * Plugin Name: Jetpack: Auto-Expand Publicize Settings
 * Plugin URI: http://jetpack.me
 * Description: Custom plugin to auto-expand the Publicize settings when writing a post.
 * Author: Brandon Kraft
 * Version: 1.0.0
 * Author URI: https://kraft.im/
 * License: GPL2+
 */

add_action( 'admin_head-post.php', 'kraft_auto_open_pub_meta' );
add_action( 'admin_head-post-new.php', 'kraft_auto_open_pub_meta' );

function kraft_auto_open_pub_meta() { ?>
<script type="text/javascript">
 jQuery(window).load(function(){
  jQuery('#publicize-form-edit').trigger('click');
  });
</script>	
<?php }