In 2010, Johan Bollen, an associate professor at Indiana University and two other professors published research showing how using Twitter could with more than 85% accuracy predict the daily up and down readings of the Dow.

WSJ: In the Wired World, Feeds Drive Trading

And, with no knowledge of any actual content, the Sociometer readings also predicted (with about 87% accuracy) which business plans would be chosen.

FORBES: Seven Tips for Effective Body Language on Stage