<p><strong>A 2021 <em>Daily Telegraph</em> Book of the Year</strong></p><p><strong>''Had me gripped from the outset'' Fergal Keane</strong></p><p><strong>''Everyone should read the testimonies of the Chibok girls who survived the capture'' Malala</strong></p><p>In the spring of 2014, an American hip hop producer unwittingly triggered an online hurricane with a quickly thumbed tweet featuring a four-word demand: #BringBackOurGirls. The hashtag called for the release of 276 Nigerian schoolgirls who¿d been kidnapped by a little-known Islamic terrorist sect called Boko Haram. Within hours, the campaign had been joined by millions, including some of the world''s most recognizable people: Oprah Winfrey, Pope Francis, David Cameron, Kim Kardashian and Michelle Obama.</p><p>Their tweets launched an army of would-be liberators ¿ American soldiers and drones, Swiss diplomats, spies and glory hunters ¿ into an obscure conflict in a remote part of Nigeria that had barely begun to use the internet.