This is somewhat true. However, if you stop adding data to your profile it becomes stale. Since I deleted my facebook profile I moved cities, bought a house, a different car, and have new friends in real life. My old FB profile is probably still a good indicator of which way I'd vote in an election, but it's useless now for targeted advertising. The only way to make that break is to delete your profile now; slowly over time your real life will start to change and eventually won't resemble the digital you at all.