This video explains the mechanics of the single most important online business. This is how Google makes ~98% of its $20 billion/year revenues, and probably 100

This video explains the mechanics of the single most important online business. This is how Google makes ~98% of its $20 billion/year revenues, and probably 100% of its $13 billion/year profit. Online startups would do well to learn how this works. I'm surprised it hasn't gotten voted up more.