If you have any email accounts registered with google, i.e. any accounts you have registered with Google+, everything you search is about to be shared all over the web via social networking. This all takes place on March 1st so theres still time to turn it off! Luckily its not that hard to do. Follow along (I have already fixed mine):
1. Sign into your Google account.
2. Go to https://www.google.com/history
3. Click “remove all Web History.”
4. Click “ok.”
Note that removing your Web History also pauses it. Web History will remain off until you enable it again. Short of deleting your google account, thats all you can do.