(Mar 26): As the upstart voter-profiling company Cambridge Analytica prepared to wade into the 2014 American midterm elections, it had a problem. The firm had secured a US$15 million investment from Robert Mercer, the wealthy Republican donor, and wooed his political adviser, Stephen K Bannon, with the promise of tools that could identify the personalities of American voters and influence their behaviour. But it did not have the data to make its new products work.

So, the firm harvested private information from the Facebook profiles of more than 50 million users without their permission, according to former Cambridge employees, associates and documents, making it one of the largest data leaks in the social network’s history. The breach allowed the company to exploit the private social media activity of a huge swath of the American electorate, developing techniques that underpinned its work on President Donald Trump’s campaign in 2016.

An examination by The New York Times and The Observer of London reveals how Cambridge Analytica’s drive to bring to market a potentially powerful new weapon put the firm — and wealthy conservative investors seeking to reshape politics — under scrutiny from investigators and lawmakers on both sides of the Atlantic.

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