A truly thought-provoking TED talk from Maajid Nawaz. He was a former high-ranking member of the global Islamist party Hizb ut-Tahrir, whose goal, broadly put, is to unite all Muslim countries into one caliphate ruled by Islamic law. His own transformation from an Islamist to someone who works to counter extremist social movements is an inspiring one and a definite watch for people interested in IR.
Here is his TED Talk. A full biography of Maajid Nawaz can be found on the TED website.