Whistleblower Christopher Wylie describes how Cambridge Analytica obtained Facebook profile data through a personality-quiz app, and how the firm marketed psychographic targeting to clients including the 2016 Trump campaign.
Congressional hearings, a UK Information Commissioner’s Office report to Parliament, a Commons select committee inquiry, and FTC actions against both Facebook and Cambridge Analytica followed over the next eighteen months. Facebook also restricted third-party app access to friend data. How much the firm’s targeting actually moved votes remains contested and is not established by any of these proceedings.