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Other Meta apps, including Facebook, Instagram and Messenger remained available for download, although use of such foreign apps is blocked in China due to its “Great Firewall” network of filters that restrict use of foreign websites such as Google and Facebook.

WhatsApp, one of the world’s most popular messaging services, and Threads were not used widely in China, which has an elaborate system to block foreign apps and websites inside its borders, known as the Great Firewall.

Vietnam is not large enough to do what China has done, and seal itself off behind its own "great firewall".

Many countries have tried to contain and control the internet citizens can see within their borders: China bans virtually all major international platforms, like Facebook to Google, via its famed “Great Firewall.”

Bluetooth, AirDrop and such file-sharing services are crucial tools in China, where the so-called Great Firewall has resulted in one of the mostly tightly-controlled internet regimes.