Foreign travelers will now be asked to provide links to their social media accounts before they enter the U.S. after the government implemented a new policy designed to identify potential threats". The request to provide links to accounts on Facebook, Twitter, YouTube, Instagram, Google+ and LinkedIn is optional. But privacy advocates and some technology companies oppose the move on the grounds it violates civil liberties and freedom of expression. The new policy, which was originally proposed this summer, was adopted Dec. 19 for people arriving via the ... Electronic System for Travel Authorization, which now asks about social media accounts in its online form. There is no clear indication of how the information gathered will be used. "An open-ended inquiry into 'online presence' would give DHS a window into applicants' private lives," a coalition of 28 civil rights and technology groups wrote in a letter in August in opposition to the proposal. "Scrutiny of their sensitive or controversial online profiles would lead many visa-waiver applicants to self-censor or delete their accounts, with consequences for personal, business, and travel-related activity. "The risk of discrimination based on analysis of social media content and connections is great and will fall hardest on Arab and Muslim communities," the letter said. "It also poses significant risks to journalists, whose profession requires confidentiality and whose social media networks may convey a profile that, taken out of context, could be misconstrued."