Tech folklore claims that the Internet routes information around obstacles, even a nuclear holocaust. As we've seen from ongoing and recent events in China, Egypt, Libya and elsewhere, including the United States, this ain't necessarily so. Humans engineered the Internet, and the forces of repression can always install devices to spy on Internet users, and even hit a "kill switch" to cut off access to all or part of their populations as they please.
But, here's an article from the Economist magazine. It describes how rebels can build tools out of bubble gum and bailing wire to preserve their access to and from the 'Net, despite the efforts of tyrants to silence them and stop their ability to organize and make trouble for the powers that be. Any means of transport, whether for bullion or bytes, email or electrons, can be hijacked by clever people. That microwave oven (tech first repurposed from military radar to cook crappy meals) on your kitchen counter might someday be a tool for democracy as potent as the printing press was in the American colonies of the Eighteenth Century. Organizations such as Tactical Tech and the Tor Project supported by the Electronic Frontier Foundation can show you how.