Some age-checking applications collect too much data and no product works 100% of the time, but using software to enforce a teenage social media ban can work in Australia, the head of the world's biggest trial of the technology said on Friday.

Social media is a huge challenge for parents. New research suggests simple family rules around screen time are associated with less problematic social media use in kids.

SYDNEY (Reuters) -When 13-year-old Jasmine Elkin tried out the age-checking software Australia might use to ban children and teenagers from social media, she was surprised some products could identify a person's age to the month - but she still doubts it will work.