The US Customs and Border Protection has started demanding that foreign travelers hand over Facebook, Twitter, and other social media account information upon entering the country, according to a report from Politico. The new policy follows a proposal laid out back in June and applies only to those travelers who enter the US temporarily without a visa through the Electronic System for Travel Authorization, or ESTA, process. The goal, the government says, is to “identify potential threats,” a spokesperson tells Politico.