The single biggest predictor of love is proximity.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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