“We have always thought of individuals as being unpredictable,” said Johan Bollen, an expert in complex networks at Indiana University. “These regularities [in behavior] allow systems to learn much more about us as individuals than we would care for.”
Today, almost three-quarters of the world’s people carry a wireless phone. That activity generates immense commercial databases that reveal the ways we arrange ourselves into networks of power, money, love and trust. The patterns allow researchers to see past our individual differences to forms of behavior that shape us in common.
[…]
As more people access the Internet through their phones, the digital universe of personal detail funneled through these handsets is expanding rapidly, and so are ways researchers can use the information to gauge behavior. Dr. Bollen and his colleagues, for example, found that the millions of Twitter messages sent via mobile phones and computers every day captured swings in national mood that presaged changes in the Dow Jones index up to six days in advance with 87.6% accuracy.
The researchers analyzed the emotional content of words used in 9.7 million of the terse 140-character text messages posted by 2.7 million tweeters between March and December 2008. As Twitter goes, so goes the stock market, the scientists found.
“It is not just about observing what is happening; it is about shaping what is happening,” said Dr. Bollen. “The patterns are allowing us to learn how to better manipulate trends, opinions and mass psychology.”
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