The vital art of talking to strangers (2021)
The cultural differences about this are vast even in the United States. In the part of the Midwest where I grew up, strangers would come up and offer compliments about your outfit or car, make friendly small talk in the grocery store checkout line, or at least offer a quiet "hi" and smile when passing on the sidewalk. In the Pacific Northwest, we try not to even look at each other when passing, although people are friendly when something does get us talking.