https://www.theverge.com/2018/3/20/17144432/facebook-investigation-new-york-massachusetts-attorney-generals-data-breach-cambridge-analytica

New York and Massachusetts attorneys general are demanding that Facebook hand over information about how Cambridge Analytica used its data. They announced a joint investigation today following reports over the weekend that Cambridge Analytica improperly acquired data on 50 million Facebook users, which it used as part of President Trump’s 2016 campaign.

According to The New York Times and The Observer, the co-founder of Cambridge Analytica, Christopher Wylie, led an initiative starting in 2014 to help political campaigns profile voters. As part of the project, the company harvested data from Facebook through a third-party quiz app.