Quora breach leaks data on over 100 million users

Today's big data breach has been announced by Q&A site Quora, affecting over 100 million registered users. What did the "unauthorized third party" get? According to CEO Adam D'Angelo:

Quora found the breach on November 30th and said it is still investigating. It has logged all users out, and forcing all accounts with a password to reset that password. It also said that the password data was salted and hashed to prevent attackers from using it, but to be cautious, users should also reset passwords on their other accounts if they shared the same one. There are emails going out notifying users of the breach, but right now all of the information available is organized in this FAQ.
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