New video-watching guidelines for teens just dropped

An old public service announcement that once aired before late-night newscasts posed a simple question to parents: "It's 10 p.m. Do you know where your children are?"

A similar prompt for safety-minded 21st century parents might go something like this: "It's 10 p.m. Do you know what your children are watching online?"

Some parents may have long given up on answering that question, even if they grasp that online videos can expose teens to inappropriate content, including bullying, self-harm, disordered eating, and porn.