Tourists entering the United States could soon have to provide a five-year social media history.

The proposed new requirement would affect those who are currently able to visit visa-free, including from New Zealand and the UK.

It'll see officials requesting social media information, email addresses from the last decade, phone numbers, and information about family members.

Australian correspondent Murray Olds says many Australians travel to the US every year, and this change will likely slow down tourism further.

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