Hacker News on 28 September 2013

• Why Free Software Is More Important Now Than Ever Before
• Thoreau 2.0
• UTF-8 – "The most elegant hack"
• N.S.A. Examines Social Networks of U.S. Citizens
• My time with the Steam Controller
• Spaced repetition for study and learning
• Underscore Price Dynamics
• We Like You So Much and Want to Know You Better
• GNU 30th anniversary
• RegEx101.com now offers a debugger