https://www.reuters.com/article/us-facebook-privacy-britain-zuckerberg/buck-stops-with-zuckerberg-in-facebook-data-scandal-cto-idUSKBN1HX28N >The buck stops with Facebook chief executive Mark Zuckerberg when it comes to the fallout from a recent data scandal that has impacted millions of users, the firm's chief technology officer told UK lawmakers.