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British journalist Carole Cadwalladr used her TED Talk in Vancouver to put Twitter CEO Jack Dorsey on the hot seat the evening before he was due to take the stage.

Cadwalladr, a writer for the Guardian and Observer in the U.K. who broke the story about how the United Kingdom’s Brexit referendum was hijacked by illegal advertising on Facebook, included Dorsey by name, along with Mark Zuckerberg and Google moguls Larry Page and Sergey Brin.

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“The technology you have invented has been amazing,” Cadwalladr said of the platforms, but they have become “hand maidens to a form of authoritarianism,” in the online abuse and misinformation being distributed via their platforms.

“You set out to connect people and are refusing to acknowledge that the same technology is now tearing us apart,” Cadwalladr said, during her talk Monday evening.

Dorsey, when he took the stage Tuesday morning in a discussion with TED leader Chris Anderson and curator Whitney Pennington Rodgers, acknowledged Twitter’s problems.