He added that the "overwhelming majority" of the content that was accessed was already public on Quora, but the compromise of account and other private information is "serious".
It also includes content like posted questions, answers, comments and upvotes - which is public anyway - as well as answer requests, downvotes and direct messages.
The question and answer community Quora confirmed today that up to 100 million accounts of users were compromised in a data breach. They have not yet provided more information as to what imported data may have been compromised. In case you wish to delete your account and all the data associated with it, follow this link.
Marriott disclosed on November 30 a massive data breach for about 500 million guests who booked reservations at its Starwood properties.
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On the security threat, Quora said, "We believe we've identified the root cause and taken steps to address the issue, although our investigation is ongoing and we'll continue to make security improvements". On Monday it began emailing affected users.
The company said it is logging out all Quora users who may have been affected to prevent further damage.
Ankush Johar, Director at enterprise security firm Infosec Ventures, said, "It is imperative for any firm that is operating at a Global or even National level to take necessary steps that ensure security". The email is an exact copy of the post on the Quora website.
If you think you have a Quora account, the best thing to do is change your password. Quora also notified law enforcement.
Quora has posted an extensive FAQ explaining details of the data breach, but the FAQ doesn't mentioned how user passwords were hashed, i.e. run through a one-way encryption algorithm.