Still, it's noteworthy that building machines that canpass for humans now seems to be one of Google's explicit goals. And there are real differences between granting intimate access to your life to a person you trust and granting the same access to one of the most powerful corporations the world has ever seen. For one thing, if a human assistsnt started using your personal data to sell advertisers aces to your time in unguarded moments,you'd probably fire them.