(San Jose Mercury News) People in Silicon Valley like to say it’s not about the money, it’s about changing the world. But with Bitcoin, it’s about changing the money to change the world.

Dot-com pioneers and fresh-faced 20-somethings alike are founding companies to help transact the virtual currency. A nationwide network has formed for angel investors keen to back such startups. And the Winklevoss twins — made famous by “The Social Network” film — plan a Bitcoin investment fund.

But what is “virtual currency,” anyway? And are those chasing Bitcoin headed for a gold rush, or fool’s gold?

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