Question-and-answer website Quora has issued an urgent warning to 100 million of its users. Hackers obtained account and user information (name, email, IP, user ID, encrypted password, personalization data) Quora CEO Adam DAngelo extended a personal apology to affected users on behalf of his company. Affected users will also see their passwords invalidated, meaning they will have to set new passwords to continue using the service. Quora said it is logging out all users who may have been affected in “an abundance of caution””]