https://www.reuters.com/article/us-facebook-cambridge-analytica-apology/facebooks-zuckerberg-says-sorry-to-britons-with-newspaper-apology-ads-idUSKBN1H10AF >Facebook Chief Executive Mark Zuckerberg apologized to Britons on Sunday over a "breach of trust", taking out full page advertisements in British newspapers after a political consultancy got its hands on data on 50 million users.