US senators put executives from YouTube, TikTok and Snapchat on the defensive on Tuesday, questioning them about what they are doing to ensure young users’ safety on their platforms. Citing the harm that can come to vulnerable young people from the sites – ranging from eating disorders to exposure to sexually explicit content and material promoting addictive drugs – the lawmakers also sought the executives’ support for legislation bolstering protection of children on social media. But they received little firm commitment. “The problem is clear: Big Tech preys on children and teens to make more money,” Senator Edward Markey said...