The Islamic State's ability to sustain itself through recruitment, propaganda and financing of its operations have bolstered its ability to survive as the U.S.-led military campaign against it has faltered. But U.S. officials are focusing on changing that dynamic and hoping to alter the military balance as well. Wednesday, Mark Wallace, CEO of the Counter-Extremism Project, told a House Oversight subcommittee that the weaponization of social media platforms by extremist groups is "a cancer that continues to grow unabated."