By Tim Lister CNN (CNN) -- In the 14 years since the 9/11 attacks, the face of terrorism has changed out of recognition. To many experts, the threat of Islamist terror is in some ways greater and in some ways diminished. It is geographically more diverse and organizationally more divided, and leverages social media and the internet in a way impossible in 2001. In the West, Islamist terrorism is often more inspired than organized and directed. Its menace is also more fluid and unpredictable than it was on that bright autumn morning in 2001, but the tools to combat it are also more plentiful, from ever more sophisticated and accurate drones to financial intelligence and algorithms for chewing terabytes of data in the pursuit of suspicious communications. The likelihood of an attack on the scale of 9/11 has receded. but the probability of more frequent though less devastating attacks has increased....