Huh? The US has been very aggressive about shutting down websites that spread Al-Qaeda and ISIS propaganda on most websites. ISIS basically caught everyone with their pants down spreading their stuff on social media, but once people started noticing it, it was purged rapidly.
It's not my view, but you could make the argument than the original sin was censoring Al-Qaeda content post-9/11. Obviously, nobody complained. Now the same tactics are being turned against the far-right and people have discovered a new love for free speech.