They compete with each other in the same way the McDonalds and Burger King compete for the cows that are made into hamburgers .... Google's and Facebook's cust

They compete with each other in the same way the McDonalds and Burger King compete for the cows that are made into hamburgers .... Google's and Facebook's customers are the advertisers, and they compete for those. But users are the product from which the burgers are made.