"Facebook knew for two years that a data firm harvested data from more than 50 million profiles of U.S. voters without their permission but did nothing to protect its users, Guardian reporter Carole Cadwalladr told CBSN on Saturday. Cadwalladr said Facebook threatened to sue in a bid to prevent The Guardian publishing an exposé on the data harvesting."
https://www.cbsnews.com/news/cambridge-analytica-facebook-knew-for-two-years-no-action-taken/