Hacker News on 12 February 2015

• Deleting any Facebook album
• How One Stupid Tweet Blew Up Justine Sacco’s Life
• Show HN: Let's Chat, a self-hosted chat app for small teams
• 0h n0 – A new game from the makers of 0h h1
• New Tesla battery could power your home, and maybe the electric grid too
• Rat Park
• Lisp as the Maxwell Equations of Software (2012)
• A regular expression to check for prime numbers
• GnuPG 2.1.2 released
• Principal component analysis explained visually