For generations parents were able to draw on their experiences and teach their children by example. Social status wasn’t measured in Facebook friends, Instagram followers and “likes.” Group chats only happened on the playground. Now cellphones and computers expose any user to just about anything. Instead of spending family time at the dinner table connecting, people get fixated on being “somewhere else” online. Parenting involves bringing up children who don’t default to their phones as a primary source of information or communication. When it comes to education on social media, privacy and consent, we tell teens to be careful about what...