Anonymous questions and answers were not affected by the breach because Quora doesn't store the information of anonymous contributors.
Quora said it's in the process of notifying all users who it believes were impacted by the hack.
The affected data includes account details such as names, email addresses and encrypted passwords, as well as any data imported from linked networks when authorised by the user.
Hackers also gained access to some public content and actions such as answers, upvotes, comments and questions.
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Quora has started notifying users whose data has been compromised, and will log them out of the site "out of an abundance of caution".
According to a blog post by the company's chief executive Adam D'Angelo, Quora has informed law enforcement officials and brought in cyber security specialists to help them address the breach.
What's more, there have been some reports that Quora was creating profiles for users based off their linked accounts without their knowledge. It has logged all users out, and forcing all accounts with a password to reset that password.
Quora first realised it had been compromised on Friday and immediately began investigating. The hacker had copied and encrypted information and "took steps toward removing it", Marriott said. The email is an exact copy of the post on the Quora website.
Or you could completely delete your account by going to your profile picture settings privacy delete account. Passwords used by affected accounts will be invalidated.
The tech site also said it already took steps to "contain the incident" and prevent future unauthorized access to its servers.