Website as an economic indicators

A study was conducted to study the correlation between website usages and economy!! We now have all sorts of monitoring devices and data points that enable us to track human behavior.

It is conveninet to believe some activities (like visiting a particular type of website) will affected by economy. But would this correlation substanitable ? giving the fact that the web content changes constantly and new websites are created daily?

http://news.bbc.co.uk/2/hi/technology/7459055.stm