https://qz.com/1245049/the-cambridge-analytica-scandal-affected-87-million-people-facebook-says/

Up to 87 million Facebook users’ personal data may have been improperly shared with Cambridge Analytica—nearly 40 million more users than previously reported.

The revelation was buried deep in a lengthy update from Facebook today (April 4) about about its plans to restrict data access for third-party apps, like the one that siphoned off data for Cambridge Analytica, the UK political consultancy that advised the 2016 Trump presidential campaign.