Cambridge Analytica, the Trump campaign’s data firm, harvested private information from more than 50 million unwitting Facebook users in what is being described as one of the largest data breaches in the social media giant’s history. That data — taken without authorization — was used to build a digital operation that guided Trump’s campaign for the presidency, according to a pair of bombshell reports published Saturday by the New York Times and The Observer of London. The revelation that a firm working for a U.S. presidential candidate stole personal data from millions of Americans has sparked outcry across the country. Within hours of being published, the explosive reports had already prompted at least one state attorney general to launch an investigation into the allegedly fraudulent practices.