The U.S. surgeon general recently recommended that all social-media platforms come with a warning label alerting parents and young people of their risks. Meanwhile, some schools are moving to ban phones altogether. Apple News In Conversation host Shumita Basu talks to psychologist Mitch Prinstein, an expert in adolescent development, about what we actually know about the effects of social media on kids’ brains — and his compassionate advice for navigating smartphone use in your family.