Hacker News on 11 December 2017

• Exercism – Level up your programming skills
• Former Facebook exec says social media is ripping apart society
• The Case for Learned Index Structures
• HP laptops found to have hidden keylogger
• Design Principles
• Estonia, the Digital Republic
• Homebrew 1.4.0
• Apple Buys Shazam to Boost Apple Music
• Donald Knuth's Christmas Lecture: A Conjecture That Had To Be True [video]
• Tech luminaries call net neutrality vote an 'imminent threat'