Facebook staff raised concerns about Cambridge Analytica in September 2015, per court filing

Further details have emerged about when and how much Facebook knew about data-scraping by the disgraced and now defunct Cambridge Analytica political data firm. Last year a major privacy scandal hit Facebook after it emerged CA had paid GSR, a developer with access to Facebook's platform, to extract personal data on as many as 87 million Facebook users without proper consent. Cambridge Analytica's intention was to use the data to build psychographic profiles of American voters to target political messages -- with the company initially working for the Ted Cruz and later the Donald Trump presidential candidate campaigns.