https://www.theguardian.com/technology/2018/jul/27/twitter-share-price-tumbles-after-it-loses-1m-users-in-three-months

Firm says fall is linked to action to delete fake accounts to improve ‘health of the platform’

More than $6bn (£4.6bn) has been wiped off the market value of Twitter after the social media service reported a drop of 1 million users after it finally took action to delete fake and offensive accounts.