The CEOs of tech giants Facebook, Twitter and Google faced a grilling from US politicians yesterday. Lawmakers tried to make them acknowledge their companies’ roles in fuelling deadly violence at the US Capitol in January. In a hearing by the US House Energy and Commerce Committee, representatives questioned Facebook CEO Mark Zuckerberg; Sundar Pichai, the CEO of Google, which owns YouTube; and Twitter chief Jack Dorsey over their content policies, use of consumers’ data and children’s media use.