Facebook boss apologises in UK and US newspaper adsFacebook boss Mark Zuckerberg has taken out full-page adverts in several UK and US Sunday newspapers to apologise for the firm's recent data privacy scandal. In the advert, Mr Zuckerberg said a quiz developed by a university researcher had "leaked Facebook data of millions of people in 2014". The ads contained no mention of the political consultancy accused of using the leaked data, Cambridge Analytica, which worked on US President Donald Trump's 2016 campaign. About 270,000 users' data was collected, but the app also collected some public data from users' friends without their knowledge. Facebook has said Dr Kogan passed this information on to Cambridge Analytica without its knowledge.