Google received 6% of all traffic worldwide. Meanwhile, 29 other giants, including Facebook, Yahoo and Microsoft, rounded out the top 30% of traffic—meaning that these days, a few big sites are getting a lot of the Internet’s traffic. Considering that only 52% of Internet traffic is web-based, this is even more significant. (The other 48% is made up of email and private networks. And did you know that P2P constitutes 18% of Internet traffic? That’s down from 40% two years ago.)
http://www.marketingpilgrim.com/2009/10/google-1-site-worldwide-with-6-global-traffic.html