If you are on your way to China or are just the curious kind, you may want to know which sites are blocked by the Great Firewall and which are freely accessible. There are a few ways to do so, but none of them are perfect.
So what’s the problem with using these tools? Well, there are a few problems, but the most important one is that the sites that are and aren’t blocked are constantly changing. Whether this is because some official has changed their mind about what’s allowed, or because some shadowy algorithm has given the green light on a web page, is unclear.
The upshot is that the only way to find out for sure whether a site is accessible from the People’s Republic is to go there and check for yourself.