They search, you click.
Is Too Much Plus a Minus for Google? « StevenLevy.com.
I think it may have gotten eaten in the Great VPS Death of 2012, but this reminds me of the post I had queued up somewhere of a guy comparing two sets of Google search results on the same keyword (“egypt”) at the same time, but on different machines. They looked nothing alike.
If you don’t think that’s a problem, you haven’t been paying attention.