Do we really WANT to shut them down?
Is it possible its much better to have them up and running and MONITORED so whatever they are communicating can be anticipated and thwarted?
Just a thought.
Another is setting up bogus terrorist websites of our own to dispense “misinformation” to create chaos in their operations.
It is better to make the enemy BLIND, DEAF, and MUTE rather than wait for a lucky moment where we can find some little intelligence about someone and because they are so many of them and because they are very careful to not give sensitive information on the public forums but rather in private chat rooms, and they are taught very well how to hide their IP addresses.
It is better to shut their websites and forums down and simply prevent them from communicating.