Facebook faces fresh questions over when it knew of data harvesting Allegations come as US prosecutors investigate claims of cover-up Carole Cadwalladr @carolecadwalla Sat 16 Mar 2019 21.16 EDT First published on Sat 16 Mar 2019 17.00 EDT The Cambridge Analytica Files https://www.theguardian.com/technology/2019/mar/16/facebook-fresh-questions-data-harvesting-cambridge-analytica