Add WordPress' Jetpack Publicize support for movies

functions.php

<?php
function wpmoly_movie_publicize_support( $args, $post_type ) {

	if ( 'movie' != $post_type ) {
		return $args;
	}

	$support = array_merge( $args['supports'], array( 'publicize' ) );
	$args['supports'] = $support;

	return $args;
}
add_filter( 'register_post_type_args', 'wpmoly_movie_publicize_support', 10, 2 );