Basically with things like Gnutilla and Bit Torrent the cost is pushed out to the clients ISP's and spread around. But these video blogs are being served from some sort of CDN (Content Delivery Network, what I used to call Distributed Servers). They are either paying for bandwidth at some incredable expense to the company or have planned from day 1 to get so much traffic to be able to force all the major backbones to PEER with them and this would basically give them free Bandwidth. Peering is only an option for the very largest players where there is so much user Demand that is starts to cost a large ISP more money to not host your content or provide a free conntection to you then to not do that. This is the equavalent of a cable company charing small player to put of TV shows, but fot HBO the have to provide it or loose customers.
From a Dec 15, 05 press release: "YouTube already is serving more than 3 million videos, adding 8,000 video uploads and transferring 16 terabytes of data. " From Feb 14, 06 "is now receiving more than 20,000 uploads per day." and from About YouTube "With over 25 million videos served up daily " and "YouTube is currently serving over 45 terabytes of video per day"
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