Hacker News on 4 December 2013

• Valve joins the Linux Foundation
• NSA tracking cellphone locations worldwide, Snowden documents show
• Have I been pwned? Check if your email has been compromised in a data breach
• Show HN: I made an HN for the financial industry
• DHS stalls no-fly list trial by putting witness on no-fly list
• Kima15: $150K for 15% in 15 days
• Sheerwind
• Has StackOverflow saved billions of dollars in programmer productivity?
• Kicktrolling
• SpaceX Successfully Completes First Mission to Geostationary Transfer Orbit