Instagram is making teen accounts private by default as it tries to make the platform safer for children amid a growing backlash against how social media affects young people’s lives.Beginning Tuesday in the U.S., U.K., Canada and Australia, anyone under under 18 who signs up for Instagram will be placed into restrictive teen accounts and those with existing accounts will be migrated over the next 60 days. Teens in the European Union will see their accounts adjusted later this year.Meta acknowledges that teenagers may lie about their age and says it will require them to verify their ages in more instances, like if they try to create a new account with an adult birthday. The Menlo Park, California company also said it is building technology that proactively finds teen accounts that pretend to be grownups and automatically places them into the restricted teen accounts.The teen accounts will be private by …