What does it mean if a guy smiled at you?

Anonymous
I know you're probably thinking, "If a guy smiled at you, it means a guy smiled at you." But the reason I am asking this is because I often see this one guy (I'm in college) and he usually looks at me and smiles when we see each other on campus. Does this meaning anything? At all? Why do guys just smile at random girls? Or is this not random at all? Help guys.
What does it mean if a guy smiled at you?
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