I've been asked several times over the last month by skibare, a regular reader and (infamous) Level 3 partisan, to discuss the bandwidth choices of the most bandwidth intensive of the current generation of websites. He has in mind MySpace, Facebook, Youtube, and Skype, but I will comment on the bandwidth choices of such sites in a more general fashion.
Large and quickly growing websites like these almost never buy all their bandwidth from one provider, they always put their bandwidth eggs in more than one basket. It is called multihoming, and it is necessary in order to avoid disruptions that inevitably happen on any backbone over time - fiber cuts, router misconfigurations, whatever. You can buy blended bandwidth from providers like Internap, but that is usually something smaller players do. The largest websites and applications generally do it themselves and always pick their bandwidth building blocks from the largest wholesale IP transit suppliers. They shift the blocks around in order to play each provider off the others to bring the pricing down, but the major result is that nobody gets more than half of the business and rarely that.
So yes I'm sure that MySpace, Facebook, Youtube, Skype, and most others use large Level 3 pipes to power their sites. I'm also sure they use large pipes from Cogent, AT&T, Global Crossing, Savvis, etc alongside and in various combinations. In a way, it highlights part of why IP transit sucks as a standalone product: there is a natural ceiling on market share that has nothing to do with cost structure and quality of service, but there is no floor. To put it another way, you can lose, but you can never win. There was a day when it was glamorous to be serving IP transit to big websites, but the business model never worked for anyone and the survivors of that war are survivors and not victors.
That's why the healthier of the wholesale IP transit providers (AT&T, Level 3, Internap) have entered the CDN space. They seek to shift their business model, to offer IP transit as one component of a portfolio of services that also may include CDN, colocation, voip, etc, all directed at the Facebooks, Youtubes, MySpaces, and Skypes of the world. Hopefully it will work this time.
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