Based on the Googler's comment above, I think both are true. I can fully believe that test data has to be obtained from certain sources for development and wh

Based on the Googler's comment above, I think both are true. I can fully believe that test data has to be obtained from certain sources for development and whatnot. But once the algorithm is in production , I'm sure its sifting though your stuff as you are browsing just like everything else.