Arbor Networks Security Blog has an interesting post about Google’s Internet traffic:
Google now represents an average 6.4% of all Internet traffic around the world. This number grows even larger (to as much as 8-12%) if I include estimates of traffic offloaded by the increasingly common Google Global Cache (GGC) deployments and error in our data due to the extremely high degree of Google edge peering with consumer networks. (…) A quick analysis of the data also shows Google now has direct peering (i.e. not transit) with more than 70% of all providers around the world (an increase of 5-10% from last year).
Arbor Networks uses data from more than 110 ISPs distributed across 17 countries. In 2007, Google only represented about 1% of all Internet traffic, but YouTube’s growth managed to dramatically increase the percentage. Today, people are watching 2 billion videos a day, 20 times more videos than 4 years ago. According to Craig Labovitz, the overall Internet traffic grows about 45% each year.