Are they also using people&#x27;s browsing history to &#x27;find&#x27; content? E.g. from their safety filter?<p>Though I don&#x27;t think it&#x27;s happening, I&#x27;ve thought it&#x27;d be very clever if users became the search spider for Google, telling them when content had gone stale and&#x2F;or doing the spidering on Google&#x27;s part. Just by using Google&#x27;s browser.