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Much, much more complicated than that. I've been in Hong Kong a few years ago and exchanged a few tweets with a friend who was traveling with me but staying at a different hotel. The tweets arrived 2 days after we left HK. In order to pull this out you gotta have a lot more than just packet inspection (huge pipelines, storage management, etc). It's not called "the Great Wall of Internet" for nothing.

Right, yeah I suppose they have internal censorship too, so can't even use the same SSL as we do! A different world indeed!