The claim that this is a data breach is completely false. People knowingly provided their information, no systems were infiltrated, and no passwords or sensitive pieces of information were stolen or hacked. We are committed to vigorously enforcing our policies to protect peoples information. We will take legal action if necessary to hold them responsible and accountable for any unlawful behavior. We are constantly working to improve the safety and experience of everyone on Facebook. We have made significant improvements in our ability to detect and prevent violations by app developers.”]
Source: https://about.fb.com/news/2018/03/suspending-cambridge-analytica/