CDN: Content Delivery Networks

I was wondering, how much bandwidth might be consumed by giants like youtube.com. I came across this site

http://willy.boerland.com/myblog/youtube_bandwidth_usage_25_petabytes_per_month
Some interesting statistics of youtube around July, 2006, estimated at least 25 petabytes/month consumed by youtube
and then noted that, youtube's muscle power for bandwidth is given by a company called limelightnetworks.

Just take a look at their content delivery map.

Is this the future akamai?

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