Could it be Computer Lib/Dream Machines by Ted Nelson:
Cover of the 1974 edition: http://blogs.brandeis.edu/sarahw/files/2011/03/cover1.jpg
Front cover of the 1987 edition (in yellow): https://www.amazon.co.uk/Computer-Lib-Dream-Machines-Tempus/... (sorry, I have no image of the back cover, but I have both editions in my book shelf: Also the 1987 edition shows a superhero on its back cover (cover of Dream Machines)).
EDIT: If you want to order a reprint of the 1st edition (very difficult to get): Ted Nelson sells them again: http://hyperland.com/LibPage
https://www.amazon.com/Internet-Kids-Ted-Pedersen/dp/0600590...
"GEEK: A geek is someone who is really excited by computers and proud of it" -- this is the reason I was proud to call myself a geek from 6yo onwards :)
I miss Gopher, in a rose-tinted glasses nostalgia-driven way