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I smell some thing fishy reading Wojcicki's interview on Reuters.

" What we are very careful about is traditional behavioral targeting," Wojcicki said. "Nothing is stored, nothing is remembered. It all happens within that session."
How long is a Google Search session? I have heard various numbers ranging from 8 minutes to 15 minutes on an average depending on the country. Now thats a lot of time and a person can be doing tens (if not hundreds) of queries in that time. I personally think there is something profound hidden there. Correct me if I am wrong.