https://www.reuters.com/article/us-facebook-results/facebook-forecast-for-slowing-growth-rising-expenses-sends-stock-down-22-percent-idUSKBN1KF2U5

Facebook Inc on Wednesday warned revenue growth would slow in the second half of the year and said that expenses would grow faster than revenue next year, sending shares down as much as 22 percent over concerns about the impact of privacy issues on the social media company's business.