Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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The single biggest predictor of love is proximity.
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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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Wearing red increases attraction.
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