Christopher Wylie hearing: Cambridge Analytica whistleblower to give evidence to US Congress over Facebook data breach

A former employee of Cambridge Analytica who claims the firm used the personal data of tens of millions of Facebook profiles to allegedly help Donald Trump's election campaign, is to testify before US Congress. Christopher Wylie said he had accepted an invitation to give evidence to the US House Intelligence Committee and House Judiciary Committee this week. He disclosed last month that the political consultancy firm had harvested data from users of the social media site by using personality quizzes to build up psychological profiles. As the US election approached, he said it then used this data to target them with bespoke political advertising. His revelations triggered investigations in the UK and US.