Facebook is taking new steps to limit advertisers’ ability to reach teens with targeted ads. With the change, advertisers will no longer be able to use “interests” or information gleaned from other services to show ads to Facebook, Instagram and Messenger’s youngest users.The change won’t prevent advertisers from reaching teens at all — they can still use broad demographic information like age, gender, and location — but the update will prevent more granular data from being used, including info from third-party websites and apps.Instagram is also making several changes to make teens on its platform less visible. The app will begin making new accounts private by default for teens younger than 16, though teens as young as 13 can still opt for a public-facing account if they wish. Instagram said that in early tests “eight out of ten young people accepted the private default settings during sign-up,” suggesting the change could lead more teens to have non-publ