Facebook says it built Messenger Kids, a new version of its popular communications app with parental controls, to help safeguard pre-teens who may be using unauthorized and unsupervised social-media accounts. Critics think Facebook is targeting children as young as 6 to hook them on its services. Facebook’s goal is to “push down the age” of when it’s acceptable for kids to be on social media, says Josh Golin, executive director of Campaign for a Commercial Free Childhood.

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