NEW YORK (AP) — Facebook is adding a “sleep” mode to its Messenger Kids service to let parents limit when their kids can use it.

The company says parents can now specify the times kids aren’t allowed on — either as a one-time restriction or something recurring, such as after 9 p.m. every school night.

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Facebook launched the messaging app aimed at kids under 13 in December. It comes with a bevy of parental controls and no ads. But some child development experts have called for Facebook to pull it, saying it should not be making apps for kids.

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It’s just the latest example of a tech company offering some concession to critics who say they should tread carefully — or not at all, when it comes to hawking their wares to kids.

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