Facebook’s stock price plunged to a below US $20, almost half the price it debuted at in May. Facebook shares are down more than 4% today, falling to as low as $19.82. When Facebook first listed on May 18, its shares opened at just over US $42.

Facebook valuation was touted to be US $100 billion-plus prior to the IPO. The latest figures put the company’s market cap at around US $43 billion which is far far lesser than 100 billion.