But Silicon Valley isn't even a fixed geographical location before. It used to refer only to the South Bay. But during this tech boom, it has spread to as far a

But Silicon Valley isn't even a fixed geographical location before. It used to refer only to the South Bay. But during this tech boom, it has spread to as far as San Francisco to the north, and to the East Bay. It's a very fluid entity with no fixed boundaries. Facebook was started at Harvard, it only moved to Palo Alto later on. Does that make it truly a Silicon Valley company, or a johnny come lately? What about Amazon or Microsoft, the standard-bearers of the Seattle tech scene? Are they somehow not Silicon Valley even if their industry impact and business practices line up exactly with the rest of the Silicon Valley crowd? Perhaps it can be said that in some contexts, "Silicon Valley" can be synonymous with "the American tech industry in general."