Girls, In what ways do you hint to a guy that you're into him the first time you meet him?

Are there certain gestures or body language movements? Do you makes certain facial expressions or become kinda touchy? I'm just really curing about this because looking back there were moments when I thought someone was being friendly and now I realize they were most likely flirting lol
Girls, In what ways do you hint to a guy that you're into him the first time you meet him?
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