https://www.theguardian.com/technology/2019/oct/24/twitter-shares-slump-as-revenues-dip-and-costs-rise

Social media platform reports ‘headwinds’ as near-20% hike in costs dents profits

Twitter shares slumped in pre-market trading after the social network reported lower than expected revenues and higher costs and said it expected revenue “headwinds” to continue to drag on profits.