The years passed, mankind became stupider at a frightening rate. Some had high hopes the genetic engineering would correct this trend in evolution, but sadly the greatest minds and resources where focused on conquering hair loss and prolonging erections.
I don't think we became stupider, I think on average we even became smarter.
The thing is, stupid people have less inhibitions from sharing the stupid things they've been thinking and doing, and thanks to the internet they can share all of them with everyone!