Last year Mark Zuckerberg lost $2 billion in one day: http://www.dailymail.co.uk/news/article-3207033/World-s-wealthiest-lose-182billion-week-stock-market-dip-Mark-Zuckerberg-loses-1-9billion-ONE-DAY.html
I bet he did the same the same thing that Donald Trump did and won’t be paying any taxes for years