From  Carole Cadwalladr at The Guardian:

Robert Mercer was a pioneer in AI and machine translation. He helped invent algorithmic trading – which replaced hedge fund managers with computer programs…

The gays. [Rebekah Mercer] loved the gays. So did Steve [Bannon]. He saw us as early adopters. He figured, if you can get the gays on board, everyone else will follow. It’s why he was so into the whole Milo [Yiannopoulos] thing…

It was Bannon’s interest in culture as war that ignited Wylie’s intellectual concept. But it was Robert Mercer’s millions that created a firestorm. [Aleksandr] Kogan was able to throw money at the hard problem of acquiring personal data: he advertised for people who were willing to be paid to take a personality quiz on Amazon’s Mechanical Turk and Qualtrics. At the end of which Kogan’s app, called thisismydigitallife, gave him permission to access their Facebook profiles. And not just theirs, but their friends’ too. On average, each “seeder” – the people who had taken the personality test, around 320,000 in total – unwittingly gave access to at least 160 other people’s profiles, none of whom would have known or had reason to suspect.

What the email correspondence between Cambridge Analytica employees and Kogan shows is that Kogan had collected millions of profiles in a matter of weeks. But neither Wylie nor anyone else at Cambridge Analytica had checked that it was legal. It certainly wasn’t authorised. Kogan did have permission to pull Facebook data, but for academic purposes only. What’s more, under British data protection laws, it’s illegal for personal data to be sold to a third party without consent.

“Facebook could see it was happening,” says Wylie. “Their security protocols were triggered because Kogan’s apps were pulling this enormous amount of data, but apparently Kogan told them it was for academic use. So they were like, ‘Fine’.”

Kogan maintains that everything he did was legal and he had a “close working relationship” with Facebook, which had granted him permission for his apps.

Cambridge Analytica had its data. This was the foundation of everything it did next – how it extracted psychological insights from the “seeders” and then built an algorithm to profile millions more…

Dr Kogan – who later changed his name to Dr Spectre, but has subsequently changed it back to Dr Kogan – is still a faculty member at Cambridge University, a senior research associate. But what his fellow academics didn’t know until Kogan revealed it in emails to the Observer (although Cambridge University says that Kogan told the head of the psychology department), is that he is also an associate professor at St Petersburg University. Further research revealed that he’s received grants from the Russian government to research “Stress, health and psychological wellbeing in social networks”. The opportunity came about on a trip to the city to visit friends and family, he said.

Previously.