Marc Hartzman, author of God Made Me Do It: True stories of the worst advice the Lord has ever given his followers, has started a website that allows God to speak through people who speak through twitter. The site is called almightytwitter and has a bouncy design that seems to invite a lot of jokes. But the underlying premise of the site raises a practical question. How do we know what God wants? Or who He is? How do we know when God is speaking through someone? Or through us?