Facebook Founder Mark Zuckerberg had Very Bad week, Mark sister is now work for Google his high competitor, Facebook company stock value hit a new low and currently he has dropped out of the top 10 tech billionaires list.

Facebook Company the new stock price on Thursday was down 47% from its $38 debut. On Friday morning, however, the stock was up about 2%.

Mark Zuckerberg fortune fell by $423 million on Thursday to $10.2 billion. That puts him $400 million behind James Goodnight, the co-founder of SAS Institute, the new Number Ten on the $21 billion when the corporate went public in may . Mark owns 503.6 million shares of his company together with 60 million choices with an exercise price of $.06 a share. He additionally has $150 million in cash and different liquid assets, Bloomberg reports.