https://phys.org/news/2018-07-facebook-storm-bad-news.html > Shares in Facebook plummeted 19 percent to close at $176.26 Thursday, wiping out some $100 billion—believed to be the worst single-day evaporation of market value for any company. > The plunge came one day after the firm missed revenue forecasts for the second quarter and warned that growth would be far weaker than previously estimated.