Google's data-mining fu is extremely strong. This is what they do for a living. I'm sure they would be able to reconstruct a life if they choose. For every impo

Google's data-mining fu is extremely strong. This is what they do for a living. I'm sure they would be able to reconstruct a life if they choose. For every important life decision there's probably more than one search involved (having a baby? you'll search for crib, babyfood, baby crying, how to change diapers and much more) and it is certainly possible to pick that out from random searches for cribs because of boredom, checking it for a friend, etc. If you move (change IP) Google will be able to track you if you use any of their sign-in services (example@gmail.com now regularly logs in from this IP instead of the old one). Your only chance of breaking this chain is either to regularly use proxies or to change IP and gmail (and other services) simultaneously.