To stem the tide of terrorism, key terrorist origin and destination countries need to pass legislations that severely penalize families of terrorists. This will force parents of potential terrorists to take more interest in knowing what their children are up to and curb them away from their destructive path. Also this will raise the ante for suicide bombers so they'll have to put more than just their worthless lives on line.
Also, we need to put up fake Al-Qaeda recruiting websites. While the same can be done by closely monitoring the real ones, this approach offers more options. Trapped and turned, they can help us infiltrate the real ones.
These are, no doubt, extreme measures but I fear terrorism will spread like cancer if steps like these are not taken. Even now, pro Al-Queda communities are spreading. Even in Korea, an Al-Queda fan club was recently formed. It was promptly shutdown upon discovery but, by that time, its membership was 100+. While most of them were probably joking when they were carelessly posting about blowing things up, I am pretty sure a handful of them were not. Left alone, there are no limits to what misguided youths can do.