Plan would apply to countries not currently required to get visas to the US, including Britain and France
In a notice published on Tuesday, the US Customs and Border Protection agency (CBP) said it would also require any telephone numbers used by visitors over the same period, and any email addresses used in the last decade, as well as face, fingerprint, DNA and iris biometrics. It would also ask for the names, addresses, birthdates and birthplaces of family members, including children.



This is probably illegal for Europeans. They would need to pay a fine on return from the USA.
What is illegal? Revealing your social media history?
Unless the intention is to dissuade compliance with authoritarian rules, it seems very weird and even then it stills looks cruel (to fine someone who might have not had any leverage at the time)
When I see the votes here, people don’t seem to have read the article. You aren’t just required to reveal social media history. They want information about other people, too. Your family, etc. And they probably haven’t consented to giving their data to the US customs. This is against European privacy laws.
You can give your public (!) social media history to everyone you want to. It’s your own data. But it stops at other people’s data. You can’t do that.
Giving them personal data of other people who haven’t consented to it.