Quote from nutmeg:
I agree with you. Not predictive. The center for disease control is using google to track flu outbreaks based on searches for flu. No one is going to google "ingrown toenail" before they have one.
the analogy you're using is flawed: one person getting a hang nail doesn't increase the chances of someone else getting a hang nail.
when someone sees a stock decline, they google "stock market" or some other term. If they then sell their stock it will further depress the price of stocks. this will make more people google for stocks... and so forth
i agree with the website that its a reinforcing cycle. regardless its something new to look at.