gist.php

<?php
/*
Plugin Name: Disable Publicize Autoselect
Description: Prevent Publicize connections from being auto-selected.
Version: 1.0
Author: Ryan Cowles
Author URI: http://ryanscowles.com/
Plugin URI: http://jetpack.me/2013/10/15/ever-accidentally-publicize-a-post-that-you-didnt/
*/
add_filter( 'publicize_checkbox_default', '__return_false' );