What signs would a shy girl show that she's interested in you?

What signs would a shy girl show that she's interested in you? Would a shy girl act differently to a guy she's interested in person as opposed on facebook/myspace? If so, how would she show that she's interested both in person and on facebook/myspace? What gestures or actions would she use to show that she's interested in you?
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Is there a way how she talks to you (ex. tone, voice, etc.)?
What signs would a shy girl show that she's interested in you?
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