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Michael and Xochi Birch met in a London pub back in 2005. Later, the pair decided to launch a social network from their San Francisco living room. About 40 million people signed up and two years later, AOL plunked down $850 million to buy the site. The Birches, who reportedly owned a 70 percent stake in the company, walk away with $595 million. Our advice for the first few dollars spent, below.

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