Hacker News on 21 April 2016

• How I Hacked Facebook and Found Someone's Backdoor Script
• Show HN: I made an interactive Bootstrap 4 cheat sheet
• Ubuntu 16.04 (Xenial Xerus)
• Amazon open-sources Ion – a binary and text interchangable, typed JSON-superset
• Drone believed to have hit British Airways flight 'may have been a plastic bag'
• BootStrap 4 cheatsheet
• FBI Paid More Than $1M to Hack San Bernardino iPhone
• Why the S.E.C. didn't hit Goldman Sachs harder
• Jarvis: an Amazon Echo clone in your browser
• Eyes Everywhere: Encryption programmer Paul Le Roux and his commando kill squad