The quiz app developer at the center of the Cambridge Analytica scandal, Aleksandr Kogan — who harvested and sold/passed Facebook user data to third parties — has accused Facebook of ...

The bug was reported under Facebook's Data Abuse Bounty Program, enacted on April 10 to report suspected app issues. To access the quizes, the application requires users login via Facebook.

In that case, the app deliberately exploited Facebook's data practices to harvest people's personal information for political ad targeting purposes. As many as 87 million users may have been affected.