https://www.cnet.com/news/cambridge-analytica-says-kogans-facebook-data-was-ineffectual/

Voter profiling firm Cambridge Analytica says the Facebook data it obtained was "ineffectual."

In a Tuesday press conference, Cambridge Analytica spokesman Clarence Mitchell said that in 2014 and 2015 the company tested whether data from an app called This Is Your Digital Life, developed by Cambridge University lecturer and GSR founder Aleksandr Kogan,  could improve the performance of advertising campaigns.