Christopher Wylie was a research director at Cambridge Analytica. When he joined the company its goal was countering extremists who were using social media to recruit followers. But then the company began collecting personal data from Facebook users, and used it to target people susceptible to conspiracy theories and disinformation during the 2016 presidential campaign. Wylie left the company and became a whistleblower.
The Guardian's Carole Cadwalladr's investigation into Cambridge Analytica's role in Brexit has led her to Russian connections and the Trump campaign. She says British investigators are now "working very closely with the FBI."
Ben Mezrich's The Accidental Billionaires painted an unflattering portrait of Facebook creator Mark Zuckerberg. The film version gets the programmer-nerd details (and Harvard's oak-and-crimson ambiance) right -- but fails to see the upside of a worldwide social network.