During World War I, Allied forces used aircraft and balloons to drop propaganda leaflets over German-occupied countries to combat the enemy’s psychological welfare. South Korean activists have also long used balloons to deliver information critical of the North Korean regime to those on the other side of the demilitarized zone.
Now, Hong Kong’s protesters are using AirDrop, a file-sharing feature that allows Apple devices to send photos and videos over Bluetooth and Wi-Fi, to breach China’s Great Firewall in order to spread information to mainland Chinese visitors in the city. Leaving AirDrop settings open allows anyone in the vicinity to send files to your device.
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