US can do little to stop terrorists spreading their ideology online – extremism expert

WATCH FULL SHOW http://youtu.be/ZtmFq8o1S2A The Sydney siege was the latest in a seemingly growing list of “lone-wolf” attacks around the world. The rise of new media and technologies like the Internet have made it easier than ever for radical ideas to find fertile soil. Does the increasing popularity of such attacks signal a tactical shift in terrorism, or are they the result of isolated, ...