Hacker News on 12 February 2018

• Let’s talk about usernames
• German court rules Facebook use of personal data illegal
• Facebook lost around 2.8M U.S. users under 25 last year
• Lessons from Optics, the Other Deep Learning
• The Long, Slow Decline of BitTorrent (2017)
• Unilever threatens to pull its ads from Facebook and Google over 'toxic content'
• Appropriate Uses for SQLite
• Picture of a Single Atom Wins Science Photo Contest
• My professional opinion as a blockchain researcher: I don’t see the point (yet)
• How Apple Plans to Root Out Bugs, Revamp iPhone Software