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To make you feel safe
People sometimes smile to others to make them feel comfortable or at peace. This is one reason why random strangers sometimes smile to kids.
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It’s a part of the culture
In some cities, people smile to strangers as a part of their culture. In such a case, strangers can smile to you as a result of the habit they learned.
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They are being nice
People can smile to others to show that they are nice and friendly. This is one reason why some people smile to others inside elevators.
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They are extroverts
Extroverts find it easier to connect with strangers. Extroverts are thus more likely to smile to strangers than introverts. (See Why are some people Extroverts?)
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They want to start a conversation
People sometimes smile to strangers in order to start a conversation with them. In such a case, a certain level of interest might be present.
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They are happy people
People who are happy are more likely to smile at others than people who are not. If a person is in a good mood then they might smile to random strangers.
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They are friendly
Some people are overly friendly. Those people might spread smiles as they interact with others.
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They want to ask you for something
If a person wants to ask for help such as asking for directions then they might smile to you first. If those people got a smile back then they might proceed to ask for the favor.
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They want to socialize
Some people smile at random strangers because they like socializing. If those people get a smile back then they will start a conversation.
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They are confident
When a person feels confident about themselves, they might feel like smiling to others. Smiling to people in such a case is one way of being humble.
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They think you are attractive
A person could smile to you if they believe you are attractive. In such a case, those people might be hoping to get to know you. (See What makes a person attractive?)
Why random strangers smile at you?
