Facebook chief operating officer Sheryl Sandberg admitted that the company cannot rule out other cases of misuse of user data. Sandberg said that Facebook was first aware two and a half years ago that Cambridge Analytica had obtained user data in an illegal way. She said that the social media giant is doing an investigation and is going to do audits. The news feed will be integrated with a feature that will allow users to see all the apps theyve shared their data with and a really easy way to delete them.”]
Source: https://securityaffairs.co/wordpress/71147/hacking/cambridge-analytica-misuse.html

