This is disgusting and stupid, but will contribute to the decline of the U.S. as a place anyone anywhere else in the world wants to come to:

Travelers visiting the United States from countries like Britain, France, Germany and South Korea could soon have to undergo a review of up to five years of their social media history, according to a proposal filed on Tuesday by U.S. Customs and Border Protection.

The change would affect visitors eligible for the visa waiver program, which allows people from 42 countries to travel to the United States for up to 90 days without a visa as long as they first obtain electronic travel authorization.

In a document filed on Tuesday in the Federal Register, C.B.P. said it plans to ask applicants for a long list of personal data including social media, email addresses from the last decade, and the names, birth dates, places of residence and birthplaces of parents, spouses, siblings and children.