Back in 2008, when I had been in China for a couple of years, I wrote an Atlantic article about the repressive shrewdness of the "Great Firewall," the Chinese government's system for censoring the Internet. The Firewall was repressive in that it tried to eliminate any site or discussion the ruling Chinese Communist Party found inconvenient. But it was shrewd, even brilliant, in that it applied an amazingly light touch.
Anyone inside China who really cared about reaching forbidden zones of online discussion could do so easily enough, by paying a few dollars a month for a Virtual Private Network (VPN) or using a free-though-slow anonymizing service like Tor. But most of the Chinese public was not likely to go to the expense or bother just to reach outside sites, most of which were not in the Chinese language anyway. So in those good old days the Great Firewall found a sweet spot, effecting nearly as much censorship as a complete ban might have, while generating a minimum of disgruntled protest.
That was then. In the last few months, Internet censorship has clamped way down. "Is This North Korea?" was the title of a good Washington Post story yesterday. The NYT also had one yesterday, to similar effect.