The American website Quora, a public reference, reports that the data of approximately 100 million registered users have been stolen. Users are informed individually.
It is unclear what data has been captured, but it is probably user names, e-mail addresses and passwords. Data from linked social networks such as Facebook may also have been stolen. This could for example be a list of contacts.
The company behind the website writes a statement to investigate how such a theft can be prevented in the future.
Anyone who has never placed questions or answers on the website without logging in does not have to worry about anything. Data from anonymous users are not stored, says the company.
Quora was founded in 2009 by two former employees of Facebook. Most questions and answers on the website are in English.