Facebook share prices dropped almost 20 percent Thursday. That is believed to be the largest one-day drop of any company on the American stock market. The stock value drop amounted to a $119-billion loss. One day earlier, Facebook had released a disappointing second-quarter financial report. The report said the social media site’s user base and earnings had not grown as much as expected. The report also predicted far weaker growth in the future than had been expected. Facebook has struggled in recent years with several privacy issues. But most experts believed the company had successfully dealt with them. Many had come to consider Facebook almost immune to lasting image problems, especially after the most recent scandal involving the British company Cambridge Analytica. The political research business collected private data of tens of millions of Facebook users.