Who started the tradition of sending cards on Valentine's Day?

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In the United States, Miss Esther Howland is given credit for sending the first valentine cards. Commercial valentines were introduced in the 1800's and now the date is very commercialised. The town of Loveland, Colorado, does a large post office business around February 14. The spirit of good continues as valentines are sent out to lovers the world over with sentimental verses and children exchange valentine cards at school.