<span style="color: #222222;">The shares of Facebook plunged in the biggest one-day drop in stock-market history yesterday. The 19 per-cent drop vaporized 119 billion US dollars of the company's stock-market value, resulting into CEO Mark Zuckerberg's worth fall by roughly 16 billion dollars. </span><br />'' <br />'' <span style="color: #222222;">It was Facebook's worst trading day since going public in 2012, eclipsing Intel's decline of  91 billion US Dollars in September 2000.</span><br />'' <br />'' <span style="color: #222222;">On Wednesday Facebook warned that its revenue growth would slow down significantly for at least the remainder of the year. </span><br />'' <br />'' <span style="color: #222222;">The collapse returned Facebook shares to a level last seen in early May when it still recovering from an earlier battering over its big privacy scandal. </span><br />'' <br />'' <span style="color: #222222;">A political consulting firm with ties to President Donald Trump improperly accessed the data of tens millions of Facebook users.</span><br />'' <br />