John Naughton in The Guardian:
One of the biggest puzzles about our current predicament with fake news and the weaponisation of social media is why the folks who built this technology are so taken aback by what has happened. Exhibit A is the founder of Facebook, Mark Zuckerberg, whose political education I recently chronicled. But he’s not alone. In fact I’d say he is quite representative of many of the biggest movers and shakers in the tech world. We have a burgeoning genre of “OMG, what have we done?” angst coming from former Facebook and Google employees who have begun to realise that the cool stuff they worked on might have had, well, antisocial consequences.
Put simply, what Google and Facebook have built is a pair of amazingly sophisticated, computer-driven engines for extracting users’ personal information and data trails, refining them for sale to advertisers in high-speed data-trading auctions that are entirely unregulated and opaque to everyoneexcept the companies themselves.
The purpose of this infrastructure was to enable companies to target people with carefully customised commercial messages and, as far as we know, they are pretty good at that. (Though some advertisers are beginning to wonder if these systems are quite as good as Google and Facebook claim.) And in doing this, Zuckerberg, Google co-founders Larry Page and Sergey Brin and co wrote themselves licences to print money and build insanely profitable companies.
It never seems to have occurred to them that their advertising engines could also be used to deliver precisely targeted ideological and political messages to voters.