Boko Haram's appetite for violence and kidnapping women has thrust them to the top of the global news agenda. In a few years they all but severed parts of Nigeria-Africa's most populous state and largest economy-from the hands of the government. When Boko Haram speaks, the world sees a grimacing ranting demagogue who taunts viewers claiming he will 'eat the heart of the infidels' and calling on Nigerians to reject their corrupt democracy and return...