What i remember of the book shows a cover with a young man wearing a visor and a metal mohawk.
The story describes the main character as someone who watches TV for the government and he's able to watch a lot of tv shows on a lot of channels simultaneously taking in more information than anyone else. Then he retires after having his brain burned out and goes back home.
The kicker is that the TV programs come from parallel earths. Based on this information where it's picked up by nearly every TV on earth technology advances thanks to educational programs and commercials for products nobody's ever invented before. I especially remember them talking about subway trains that can go through stone.
Another is that with the knowledge that a revolution in an alternative world was successful a revolution in this world was inspired by it, so the political climate is all over the place.
What else i can remember about the Main Character is that he was looking at a catalog looking up what kind of mohawk he wanted when he went back to his gang.