https://www.reuters.com/article/us-facebook-privacy-germany/facebook-responds-to-german-privacy-watchdog-on-data-leak-idUSKBN1HH17V >Facebook has responded to a request for information from a German privacy official on the leak of personal data of millions of users, meeting a deadline that fell just as CEO Mark Zuckerberg prepares to testify before the U.S. Congress.