https://techcrunch.com/2018/12/03/quora-says-100-million-users-may-have-been-affected-by-data-breach/

Quora said today that a security breach may have compromised data from about 100 million users. In an email sent to users today and a blog post by CEO Adam D’Angelo, the company said a “malicious third party” gained unauthorized access to Quora’s systems on Friday. Its internal security teams and a “leading digital forensics and security form” are currently investigating the breach. Law enforcement officials have also been notified.

The company believes it has identified the root cause of the breach and “taken steps to address the issue, although our investigation is ongoing and we’ll continue to make security improvements.” Quora also added that anonymous questions and answers were not affected by the breach because it does not store the identities of people who make anonymous postings.