In the old days, Amazon sold books, Google was a search engine, Facebook was a social network and Apple sold computers.
But that's not the case anymore.
Google and Apple now sell phones. Amazon has gotten into the server business. Apple sells music. Facebook and Amazon provide online payment services. And that's just the beginning.
.. Apple, Google, Amazon and Facebook are competing with each other in markets for mobile phones, apps, social networking, retailing, advertising, finance and more.
read all: http://www.npr.org/2011/11/03/141976518/the-war-between-google-amazon-facebook-apple
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