Twitter, like many online platforms, is grappling with the spread of extremist content. Photo: Justin Sullivan/Getty Images
Twitter said Thursday it had permanently suspended roughly 1.2 million accounts for "violations related to the promotion of terrorism" between August 2015 and December 2017. More than 270,000 were suspended in the second half of last year.
Why it matters: Terrorist content is just one of the many ills facing online platforms such as Twitter, YouTube and Facebook.