To me it is a map of the hippie distribution in the United States (I travelled to many hippy business events).
There is a connection between hippie values and the development of high-tech. The first high-tech in the 80s and 90s was computer related. Since then it has been Internet related and has moved from the San Francisco Peninsula to San Francisco.
What were the hippie values that generated high-tech?
* Hippies were intent on building a new society. They were offended by the hypocrisy of the existing society and singled out the establishment's hostility to pot as an example. An anti-pot position was inherent hypocrisy for people who drank booze every day.
It was the hippie intent on building a new society and concomitant acceptance of innovation that is the hippie foundation for high-tech. (Yes, hippies also tried the Luddite direction too.)
* Hippies had a disdain for established institutions including the police and social hierarchy. High-tech is conditional on rejecting the narrow controls and restraints of earlier technologies. Barefoot-food-nut, Steve Jobs and Steve Wozniak were hippies who saw the computer being used for industrial purposes but not for fun and experimentation. They saw better uses.
* Hippies were adamant about not having a boss and not taking the established world seriously. This led them to create co-ops that introduce new foods and vegetarian tastes. It also encouraged new business explorations in retail and manufacturing. The hippies brought about the largest small business boom in American history. Multiple small businesses also generate technical innovation.
Technical innovation owes a great deal to the hippie milieu.