Over 62% of all Internet end devices/users exchange traffic with Google servers during the course of an average day, according to Deepfield, which offers tools for tracking the structure of network traffic. The study uses anonymized data from core Internet infrastructure (i.e. backbone routers).
Deerfield estimates that Google now accounts for 25% of all Internet traffic, up from 6% in 2010. The company said its research also reveals that Google has made significant in-roads in deploying caching servers with the majority of Internet Service Providers in the U.S.
http://www.deepfield.net/2013/07/google-sets-new-internet-record/
