Punctuation in text messages. Text message from a girl: Beware of the punctuation that ends sentences?

Anonymous
So today, one of my female friends told me that when you receive a text message from a girl, beware of the punctuation that ends sentences. A period usually means she's mad or disinterested. One exclamation point means she's trying to be polite and interested or enthusiastic. Many exclamation points means she's really happy or trying to be flirty. In other words, if there are no exclamation points at all, assume something is wrong... As a guy, this is the first time I have heard of this. Is there any truth to this?
Punctuation in text messages. Text message from a girl: Beware of the punctuation that ends sentences?
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