While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called contentdelivery networks to manage data and distribution.
But there is also a substantial overlap between them — such as leveraging content, information integration, and master data services — which significantly improve the delivery of an SOA project.
In other words, they want to tax content providers to guarantee speedy delivery of their data, while discriminating in favour of their own search engines, Internet phone services and streaming video.