There's only one correct answer if you want them to lead happier, more successful lives, says Yale University psychology professor Laurie Santos: "Wait as long as possible."
This is likely to encourage poor mental health — in ways that affect kids differently than adults — and distractions in the classroom, Santos says.
Social media use exposes many kids to cyberbullying, hate speech and discrimination, Make It reported in May.
"These are brains that are forming and trying to pay attention in school [while their phones are going] ding, ding, ding."
"They're not going to want to do as you say, they're going to want to do as you do," Santos says.
Persons:
Laurie Santos, Santos, Michael Robb, They're
Organizations:
Yale University, CNBC, Media, Global