On March 1, Google will unite its records of your Web searches and site visits with data they gather from everything else you do on Google (like, youTube).
If you want to opt out, Google makes it super easy.
Through Boing Boing, I found further explanation of the changes and the 4 easy steps--illustrated with screencaps---at Electronic Frontier Foundation's
Without the pix, here are the steps:
1. Sign into your Google account (like, just sign into your gmail).
2. Then, go to https://www.google.com/history
3. There, click "remove all Web History."
4. Click "ok."
This removes your history and also pauses further collection (until you opt in again).
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