Christopher Deason stumbled upon the psychological questionnaire on June 9, 2014. He was taking a lot of online surveys back then, and nothing about this one struck him as unusual. So at 6:37 that evening, Deason completed the first step of the survey: He granted access to his Facebook account.
Less than a second later, a Facebook app had harvested not only Deason’s profile data, but also data from the profiles of 205 of his Facebook friends. Their names, birth dates, location data, and lists of every Facebook page they had ever liked were downloaded.
The information was added to a huge database being compiled for a political data firm called Cambridge Analytica that later worked for Donald Trump’s 2016 presidential campaign. None of the people whose data was collected knew it had happened.
“I don’t think I would have gone forward with it if I had,” says Deason, 27.