Why do these guys smile at my friend and give me blank stares?

bekahbuddy
there are a these upperclassmen guys at my school(all friends, btw) that stare at me quite a bit. usually, they have a blank look on their faces when they do it. sometimes, a few of them stare at my friend too. but when they do stare at her, they smile.

what do these different stares mean? I've read that smiling is a sign of friendliness, but blank stares you can't be so sure of. I know one of them has talked about me before. whether he was saying positive or negative things is the question...
Why do these guys smile at my friend and give me blank stares?
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