| Christina Xu: Despite being only four years old, WeChat is more popular in China than Facebook is in the US ... many of WeChat's features are subtly optimized for "saving face" ...
 A shopkeeper: Japanese prefer not to touch other people's hands and the "change tray" creates desirable distance.
 Liliana Segura: The truth is, yes, even "hello" can feel like an unwelcome demand.
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