Hacker News on 27 May 2014

• A Hacker’s Guide to Git
• HipChat is now free for unlimited users
• Pre-orders start today for Flame, the Firefox OS developer phone
• Headroom.js – hide your header on scroll
• You shouldn’t use a spreadsheet for important work
• Mark Russinovich, Microsoft Critic, Is Now Building Azure
• Massimo Vignelli, 1931-2014
• HN Hiring
• PHP Next Generation
• Link shorteners hurt the user experience and destroy the Web