FIGHTING BETWEEN ISRAEL and Hamas around the Gaza border has been the subject of huge volumes of online misinformation, including some claims involving Ireland. The most recent wave of violence began on Saturday when Palestinian militants launched a surprise attack on Israeli civilians, prompting Israel to declare war on Hamas, the Islamist military group that controls Gaza — a strip of land about one third the area of Longford with a population of more than two million, which has been under Israeli blockade for more than 15 years. Experts investigating misinformation about the conflict have singled out X, formerly known...