Hacker News on 21 March 2018

• Tempe Police Release Video of Uber Accident
• Zuckerberg on Cambridge Analytica situation
• Tell HN: I just wanted to say: thank you, Hacker News
• Guide to Slack import and export tools
• YouTube and Reddit roll out new restrictions including channel and sub bans
• Hennessy and Patterson win Turing Award
• Protecting Security Researchers
• Why I Don't Sign Non-Competes
• California should emulate Tokyo, where housing stayed ahead of population growth
• User-defined Order in SQL