Not long ago, a typical Al Qaeda video was grainy footage of Osama bin Laden murmuring in a rural Afghan cave. Now, militant Sunnis have upped their game. Daesh runs some of the best social media campaigns in the world, with high-definition videos, radio broadcasts, video games and a glossy monthly magazine. And it's working: So far, over 20,000 foreign fighters are estimated to have traveled to the "caliphate" in Syria and Iraq.