Ebay, facebook, and youtube won't be spending much money on advertising this year. They discovered that the products and services have minimal value. The real value is the people. These new companies discovered what the people wanted. Naturally, people responded.
These companies are just a glimpse of the coming revolution.
Ebay is not trying to sell you a product, but they are helping you sell a product.
Youtube is not trying to show you something, but it allows you to show the world something.
These companies found success by finding what people want and then satisfying that want.
It may not be immediately obvious, but this model can transfer to almost any industry. Those that do it first and do it right, will win.