On Monday, Facebook announced it was pausing the development of Instagram Kids — a service designed for children 13 and under.The move comes after a Wall Street Journal investigation revealed Facebook's own internal research about how its platforms are negatively impacting the mental health of young users.On Thursday, the Senate Commerce Committee held a hearing about the toxic effects of social media on young people.So who's responsible for ensuring their wellbeing? We put that question to a panel of experts.Want to support 1A? Give to your local public radio station and subscribe to this podcast. Have questions? Find us on Twitter @1A.