Andrew Lih has an excellent post reminding us what’s important about the news that Wikipedia has suddenly, and unevenly, been "unblocked" in China:
It’s important to know there is no monolithically operating Great Firewall of China, even though it is a cute and useful moniker.
The “GFW system” depends on a distributed system of checks and
filters that depends on the particular ISP, the type of connection
being used, and the geographic locale. A commercial connection in Hubei
is different than a residential DSL in Guangdong is different than an
academic network in Shantou. Something blocked in one area of the
country may be totally fine in another. A keyword that is filtered in
one place could be allowed in another.