Chitika did a very interesting study recently and came out with even more interesting results. Namely, they made a huge survey across the USA and examined the relation between states' education levels and ad-clicking habits. They concluded that the more college educated a state is, the harder it becomes to advertise to.
"The two states with the lowest ad click rate, Massachusetts and Washington, showed a much higher rate of college education than the national average. West Virginia, which boasted the highest click rate, also had the lowest percentage of college graduates."
We all knew this already, but now it's confirmed.