Parents receive 1 out of every 5 Valentines.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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One in five long-term love relationships began with one or both partners being involved with others.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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