Do you know how you tube serve the content to the end users. (CDN) is a system of computers networked together across the internet that cooperate transparently to deliver content (especially large media content) to end users. The first web content based CDN's were Sandpiper, Mirror Image and Skycache followed by Akamai and Digital Island. The first video based CDN was iBEAM Broadcasting. it is not just the youtube. Plenty of Fish is one more example.
just google for CDN, you know more on how many commercial CDNs are available and how they can help to deliver the content behind the end user.
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