Item 1 of 2 A visitor tries to enter the visa section of the U.S. Embassy in Nine Elms in London, Britain May 1, 2018. REUTERS/Simon Dawson[1/2]A visitor tries to enter the visa section of the U.S. Embassy in Nine Elms in London, Britain May 1, 2018. REUTERS/Simon Dawson Purchase Licensing Rights, opens new tabSummaryU.S. diplomats asked to review H-1B visa applicants' LinkedIn profilesWashington says H-1B visa applicants, others should not have engaged in "censorship"H-1B visas are crucial fo...