Child development experts urge Facebook to pull Messenger Kids app

Open letter signed by more than 100 advocates warns of dangers social media poses to under 13s and asks Mark Zuckerberg to halt app

More than 110 child-health advocates have called on Facebook chief executive Mark Zuckerberg to pull the firm's Messenger Kids app aimed at under 13s, warning of the dangers of social media for children.

In an open letter led by the Boston-based Campaign for Commercial-Free Childhood, signed by doctors, educators and child health experts including baroness Susan Greenfield, warn that "younger children are simply not ready to have social media accounts".