Facebook’s looming IPO will mint a new generation of Bay Area millionaires not seen since 2004, when Google went public. Not surprisingly, the sharks of Wall Street are circling, hoping to sink their teeth into the thousands of soon-to-be millionaires. In this Portland Business Journal guest column, Vista’s Dougal Williams explains why Facebook’s new rich would be wise to learn an investment lesson from their Silicon Valley neighbor. The lesson? Run far and fast from brokers peddling get-rich schemes. Instead, invest your money using index funds.