Facebook chief Mark Zuckerberg appeared before US lawmakers Tuesday to apologize for how his company has handled the growing furor over online privacy, to promise change, and explain the social media giant’s policies. The wide-ranging questions — including about Cambridge Analytica, which used data scraped from 87 million Facebook users to target political ads ahead of the 2016 US election — put the 33-year-old billionaire under a microscope for several hours at a joint Senate committee hearing.
