Internet a driver of cognitive inequality?

Kevin Drum makes an interesting observation: "the Internet is a major driver of the growth of cognitive inequality...in other words, it makes dumb people dumber and smart people smarter."

He proposes two main mechanisms for this:
1) If you dont know how to search the internet well, you will not be able to access good information and you will be easily misled;
2) If you dont know how to differentiate good versus bad information on the Internet, you can also easily be misled or you will merely confirm your existing biases rather than learning 

I think the second mechanism is a really interesting one. Being naively misled or purposely looking to confirm biases are two ways the Internet can make people more ignorant. But I am not sure confirmation bias is more correlated with being "dumb." Humans are very susceptible to confirmation bias, and I would wager that overcoming confirmation bias is more correlated with curiosity and humility than with IQ.