Some Internet Service Providers (ISPs) are rerouting traffic going to search engines to third-party firms that gain access to your search engine history, without your consent.
In this article, there is a free tool which helps you become aware of this site redirection.
"The ICSI Networking group develops and operates the ICSI Netalyzr, a tool that tests the characteristics of users' Internet connections. Netalyzr's measurements show that approximately a dozen US Internet Service Providers (ISPs), including DirecPC, Frontier, Hughes, and Wide Open West, deliberately and with no visible indication route thousands of users' entire web search traffic via Paxfire's web proxies." Read more:
