One more example of how easy your anonymity can be pierced on the web, if, for example, search engine companies release your searching history to the public, the government or whoever, even if only by number.
Aside: I am currently in Talinn, Estonia, and have been searching the web for the name of the vegetable that comes in neon, bambino, lilac bride and kermit varieties. Why? To compete in a cruise ship quiz contest. Other searches I do not intend to reveal at this time. Bon voyage. And it is an eggplant.