(Reuters) - Facebook Inc (FB.O) on Monday rolled out Messenger Kids, an app that lets the world's biggest social media company expand into a so-far untapped market of kids under 13 while also giving parents complete control over what their children see.

Facebook normally requires users to be at least 13 years old. The new app gives it a chance to win brand loyalty from younger children at a time when it faces competition for teenagers from other social media platforms such as Snapchat.

There already are a handful of other apps that children can use with parental consent, and kids can communicate with each other using texting on cellpones.

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Facebook said research showed young children were already using technology on a regular basis - but on apps built for teens and adults, raising concern among parents that their children might be communicating with strangers.

At the same time, parents were willing to let their children aged 6 to 12 use social media as long as there was strict parental control. Facebook Messenger Kids requires parents to set up an account and approve their children's contacts.

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"There's really a gap in the market for a messaging app for kids that also gives parents control," Facebook spokeswoman Lauren Svensson said. "We're going to see how kids are using it, and that will allow us to add updates in future versions as necessary."

The stand-alone app on children's devices can be controlled by a parent's Facebook account that will allow kids to use video chat and send photos, videos or text messages to friends approved by their parents.

FILE PHOTO: A picture illustration shows a Facebook logo reflected in a person's eye, in Zenica, March 13, 2015. Reuters/Dado Ruvic/Illustration/File Photo

Monday's unveiling was billed as a preview because so far it is only available in the United States and only on iOS, or Apple operating systems. The app was 18 months in development, Svensson said.

Facebook said it consulted with 1,200 parents plus online security and child development specialists, including the National Parent-Teacher Association, the Yale Center for Emotional Intelligence, Connect Safely, Center on Media and Child Health, and Sesame Workshop.

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