If a cute girl asks to be your friend on facebook and you don't know her, is that creepy?

so lets say a girl see's you on FB she thinks your attractive and adds you... is that creepy? ... so then what if he adds her then writes do I know you? should she lie and say "oh I thought you looked familiar" or just say "nope." or is this a creepy move no matter what
If a cute girl asks to be your friend on facebook and you don't know her, is that creepy?
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