Hello what it means when people look at each others faces the moment they see me?

just happens to me sometimes when i come by some people who are setting on chairs and see me they instantly turn heads in each others and then look at me! Without any facial expressions negative or positive so what it means in ur opinion

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I mean i never do this myself why would i look at my friend face and my friend looks instantly at my face when we both see someone passing in front of us? What it really means?
Hello what it means when people look at each others faces the moment they see me?
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