> The evidence that has been presented by Google does show that MS is monitoring Google's search results, or at the very least users' behavior when using Google

> The evidence that has been presented by Google does show that MS is monitoring Google's search results, or at the very least users' behavior when using Google. I said "exclusively". > there's no evidence that Google is the only search engine that's being monitored There's no evidence that it's only search engines. > You can't just associate two websites because some users go from one to the other sure you can, if they go via a link. Now you can just notice the link and say "great, there's an association", or you can monitor which links people click on and weight the graph accordingly. "great, there's an association, and this link is more popular than that one". Nice data to capture. Not constrained to search.