In China, Facebook cannot be used.
Google cannot be used either.

If you only want to access the Facebook page itself, you can use a VPN.
However, if a website has Facebook plugins embedded, it seems to behave strangely.

I entered China on April 12th.

Initially, the behavior was simply a timeout.
If a website contains Google or Facebook plugins (buttons, etc.), the loading fails, and it takes several minutes before the page finally appears, resulting in a timeout.

At first, I simply ignored the slow connection and the inconvenience.

However, on April 27th, websites that use Facebook started redirecting to strange pages (laughs).
I was redirected to a strange page like http://wpkg.org/.

Even if it's just slow, being redirected to strange pages is a problem, so I immediately removed the Facebook plugins.
I also removed Google.

China is truly a strange place.

It seems that this problem affects not all of China, but only those using the Unicom provider.
It may only affect Unicom now, but it could potentially spread to other providers, and there are also reports that users are being redirected to pages other than the one mentioned above.

It's unclear whether this is due to the Chinese government or simply a hacking of Unicom's DNS (the function that resolves hostnames).

When I searched, I found that this problem is not only occurring in Luoyang, where I am, but also in Shanghai and other parts of China.

The only solutions seem to be to review your PC settings or, if you want to show this to a large number of people, to avoid using Facebook/Google.

Doing business with China is difficult...
Especially when it comes to networks.
You never know what might happen.