Why is Valentine's day celeberated? What is so special about this day?

February 2, 2010 7:05am CST
Valentine's day is approaching, all are being prepared. the gift shops, flower shops, restaurants are getting ready for this special day. Some give gifts, some give flowers to their loved once, some celebrate in restaurant. But one thing I don't know, why do we celebrate this day? what is so special about this day? how do you celebrate it?
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