Today, Oct. 24, is when Twitter reported its third quarter, after major feature changes including more aggressive targeting of harassment and abuse on the platform, which caused speculators to anticipate the earnings report more than usual. Their shares in total tanked nearly 20% after they reported missing their revenue target by 6%. In a letter to shareholders, they cited "a number of headwinds including revenue product issues and greater-than-expected advertising seasonality" as major roadblocks, despite revenue being up 9% year-over-year.