No 10 'very concerned' over Facebook data breach by Cambridge Analytica

Downing Street expressed its concern for the Facebook data breach that affected tens of millions of people involving the analytics company that worked with Donald Trump's campaign team. No 10 weighed in on the row as almost $20bn (£14bn) was wiped off the social network company's market cap in the first few minutes of trading on the Nasdaq stock exchange, where Facebook opened down more than 3%. After less than two hours trading, the company's losses had multiplied to almost $30bn. Theresa May's spokesman said she backed an investigation by the information commissioner, which was prompted by a whistleblower who told the Observer how Cambridge Analytica harvested millions of Facebook profiles to influence voters through "psychographic" targeting. The European parliament president, Antonio Tajani, also said on Monday that the institution would "investigate fully".