Last week, U.S. Rep. Keith Ellison, D-Minn., sent out tweets urging his nearly 16,000 followers to write to the Syrian ambassador regarding Amina Abdallah Arraf, whom he described as an American blogger "detained and held by Syrian authority." She "needs you," he said in one of his tweets. "Call for her immediate release . . . Do it now." At the time, a "Free Amina" Facebook page had garnered more than 13,000 supporters. But apparently, there was no Amina Abdallah Arraf. News reports now say she’s a fictional character on the "Gay Girl in Damascus Blog," reportedly written by 40-year-old...