The requirement, set out on Wednesday (10 December) by US Customs and Border Protection (CBP), would become part of the Esta visa waiver application process.
US CBP, which is part of the Department of Homeland Security, said the measure would strengthen compliance with an executive order made by president Donald Trump in January designed to protect the US from terrorism and other national security and public safety threats.
"CBP is adding social media as a mandatory data element for an Esta application," read the CBP's filing to the Federal Register, the US government's official journal.
