WIRED Contributing Editor Fred Vogelstein: “Facebook moved too slowly to deal with the problem”

File-This Nov. 9, 2017, file photo shows Facebook CEO Mark Zuckerberg meeting with a group of entrepreneurs and innovators during a round-table discussion at Cortex Innovation Community technology hub in St. Louis. Facebook is announcing its second major tweak to its algorithm this month, saying it will prioritize news based on users’ votes. The company said in a blog post and Facebook post from Zuckerberg Friday, jan. 19, 2018, that it will survey users about how familiar they are with a news source and if they trust it. (AP Photo/Jeff Roberson, File)

WIRED Contributing Editor Fred Vogelstein explains what happened within Facebook, leading to findings that it breached the privacy of its users. One of the strangest twists to this story lies at the beginning, when a Cambridge Analytica volunteer virtually walked through the doors of Facebook.