Youtube probably uses more than all but the top 0.0001% of sites combined (or some very very small percentage).
"All by itself, YouTube comprises 20 percent of all HTTP traffic, or nearly 10 percent of all traffic on the Net. Let's repeat that: one site takes up 10 percent of the bandwidth on the entire Net."
"All by itself, YouTube comprises 20 percent of all HTTP traffic, or nearly 10 percent of all traffic on the Net. Let's repeat that: one site takes up 10 percent of the bandwidth on the entire Net."
[http://www.webpronews.com/topnews/2007/06/19/youtube-compris...]