From Wikipedia
“The U.S. Greeting Card Association estimates that approximately 190 million valentines are sent each year in the US. Half of those valentines are given to family members other than husband or wife, usually to children. When you include the valentine-exchange cards made in school activities the figure goes up to 1 billion, and teachers become the people receiving the most valentines. In some North American elementary schools, children decorate classrooms, exchange cards, and are given sweets. The greeting cards of these students sometimes mention what they appreciate about each other.”
“Saint Valentine’s Day, commonly shortened to Valentine’s Day,is an annual commemoration held on February 14 celebrating love and affection between intimate companions. The day is named after one or more early Christian martyrs, Saint Valentine, and was established by Pope Gelasius I in 496 AD. It was deleted from the Roman calendar of saints in 1969 by Pope Paul VI, but its religious observance is still permitted. It is traditionally a day on which lovers express their love for each other by presenting flowers, offering confectionery, and sending greeting cards (known as “valentines”). The day first became associated with romantic love in the circle of Geoffrey Chaucer in the High Middle Ages, when the tradition of courtly love flourished. Modern Valentine’s Day symbols include the heart-shaped outline, doves, and the figure of the winged Cupid. Since the 19th century, handwritten valentines have given way to mass-produced greeting cards.”