How Zappos Could Help Pinterest Pin Down a Business Model

What wildly popular social network Pinterest lacks in revenue, it makes up for in users — 20 million to be precise. But after raising an eye-popping $100 million round that pegged the company's worth at $1.5 billion, internet-bubble theorists and venture capitalists wanted to know how this social network could possibly make money. Pinterest has yet to reveal a strategy, but a new feature from online retailer Zappos.com could offer one possible business model.