More than 100 child health experts are urging Facebook to withdraw an app aimed at under-13s.
In an open letter to Facebook boss Mark Zuckerberg, they call Messenger Kids an “irresponsible” attempt to encourage young children to use Facebook.
Young children are not ready to have social media accounts, they say.
Facebook says the app was designed with online safety experts in response to parental calls for more control over how their children used social media.
It is a simplified, locked-down version of Facebook’s Messenger app, requiring parental approval before use, and data generated from it is not used for advertising.
The open letter says: “Messenger Kids will likely be the first social media platform widely used by elementary school children [four- to -11-year-olds].