Mahmoud  al-Werfalli: alleged to have executed or overseen the execution of up to 33 unarmed prisoners.  ICC prosecutor Fatou Bensouda is relying on evidence from videos posted on Facebook and other social media. Photograph: Abdullah Doma/AFP/Getty Images

A case being taken against a Libyan commander is set to be a game-changer for the Hague-based International Criminal Court (ICC). It is not the heino(...)