So a nobel laureate thinks the internet is making us stupider? I'm going to have to disagree. It's just giving the stupid people a bigger audience. People have been saying things that are lies, or misinterpretations of facts or even completely made up forever. Now however, thanks to blogs and twitter and even wikipedia, these untruths are being broadcast all over the world. The same is true for the correct information as well. You can find something true on the internet just as easily as something false. The internet isn't making us stupider, it's making us more informed for better or for worse.
Also, just because someone isn't formally recognized as an expert in a field, doesn't make them unreliable or wrong. While you need a certain amount of expertise to be regarded as an authority in something, the opposite isn't true.