China: Great Firewall
China has the world's largest network firewall, blocking Google, Facebook, Twitter, and YouTube. Netizens need VPN to access.
Walls of other countries
Russia blocks Facebook and Twitter; Iran bans Telegram; North Korea only has the internal network Guangming Net; Türkiye often blocks Twitter.
Reverse by wall
The EU has also been blocked by Facebook - after the GDPR bill, Facebook once threatened to shut down European services.
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