Twitter is virtually enforcing Pakistan’s notorious blasphemy law, contends an author who recently was informed by the social-media company of a complaint that his book analyzing the minds of Islamic terrorists violated the Muslim-majority nation’s notorious statute. “It’s just absolutely surreal and Kafkaesque that a social-media giant in the free world is trying to enforce blasphemy laws — or, for now, carrying the message,” said Jamie Glazov, the author of “Jihadist Psychopath.” It was a tweet promoting his book that drew the complaint. Twitter then informed Glazov of the complaint and suggested he hire a lawyer. Referring to the Pakistani...