If you’re preordering Slack For Dummies, please do so from an indy book store or a site that supports them. The stores need all the help they can get right now. You might even get it faster; $AMZN is backed up w/ other orders. For USA: https://t.co/v4BxqdBypA h/t @sarahfrier

— Phil Simon (@philsimon) April 3, 2020