Want to visit the U.S.? Be prepared to cough up your social media history.

The U.S. Customs and Border Protection filed a legal proposal today that will make it mandatory for many tourists to submit the last five years of their social media history as part of the application required to visit the country. The public has 60 days, until early February, to submit comments to this proposal.

The social media requirement, if enacted, would apply to any visitor from the 42 different countries in the Visa Waiver Program. Rather than applying for a visa, these tourists must submit an application to the Electronic System for Travel Authorization and pay a $40 fee for visits of 90 days or less. That list includes many countries with close ties to the U.S. and whose citizens regularly visit, such as

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