Hacker News on 30 January 2012

• The Five Stages of Hosting
• Ryan Dahl steps down
• US bars friends over Twitter joke
• Megaupload: A Lot Less Guilty Than You Think
• GUM: A better CLI for Git
• Fixing the Python subprocess interface
• Silicon Valley’s Productivity Secret
• Everything You Thought You Knew About Learning Is Wrong
• Backbone 0.9.0 released
• How to set up a mail server on a GNU / Linux system