https://www.theverge.com/2018/7/26/17619424/facebook-stock-market-decline-largest-ever

After a surprisingly weak growth forecast in this week’s earnings report, Facebook’s stock price dropped 19 percent today. The decline, which erased about $120 billion in market value, is the largest one-day drop in the history of the American stock market.

Facebook shares fell as much as 23 percent in after-hours trading Wednesday, when Facebook reported its second quarter earnings. While revenue increased 42 percent in the quarter, it still missed analysts’ projections.