There is a key difference: if I went for a walk in the Marrakesh medina, there is no magical headset I could wear which would silence all the hawkers and make t

There is a key difference: if I went for a walk in the Marrakesh medina, there is no magical headset I could wear which would silence all the hawkers and make them invisible. In the electronic world, by contrast, I can easily ignore all broadcast media, use the web instead, and let robots filter out all the ads, leaving me free to browse in peace.