Hacker News on 3 April 2018

• Ask HN: What are the best MOOCs you've taken?
• Report of Active Shooter at YouTube HQ
• Be careful what you copy: Invisibly inserting usernames into text
• Spotify opens on NYSE, valuing company at almost $30B
• Apple Hires Google’s A.I. Chief
• We might be swinging away from the newsfeed
• Tell HN: 17 years on the same game
• Swedes turn against cashlessness
• A radical proposal to keep your personal data safe
• Examples of everything new in ECMAScript 2016, 2017, and 2018