From Matthew Levitt at the Washington Institute for Near East Policy:
"... (D)espite bin Laden's death, his legacy continues to present an acute threat to the West. Al-Qaeda and franchises such as al-Qaeda in the Arabian Peninsula (AQAP) as well as affiliates like Lashkar-e-Taibah and homegrown extremists inspired by al-Qaeda's radical narrative and ideology remain intent and, to varying degrees, capable of carrying out terrorist attacks. Indeed, the radicalization and recruitment has changed so significantly that according to the FBI's Assistant Director for Counterterrorism Mark Giuliano, "Thousands of extremist websites promote violence to a worldwide audience predisposed to the extremist message, and more of these websites and U.S. citizens are involved in internet radicalization." And the radicalizers creating the environment in which people are predisposed to extremist ideology are geographically and demographically diverse. "We have seen internet radicalization in individuals as young as fourteen years old," Giuliano noted.