Facebook: data 87 million people shared

Data from some 87 million Facebook users, mainly Americans, may have been transferred to research bureau Cambridge Analytica.

The issue led to a lot of controversy over the privacy of Facebook users in recent weeks. Cambridge Analytica played a bad role in President Donald Trump's election campaign. Facebook CEO Mark Zuckerberg earlier apologized and promised improvement. Meanwhile, the tech company saw billions of dollars evaporate from its stock market value.