March 1 is the day Google’s new unified privacy policy goes into effect, which means your Google Web History will be shared among all of the Google products you use. You can opt out of this tracking if you like. The link below contains information about this and instructions for opting out.
http://howto.cnet.com/8301-11310_39-57382925-285/how-to-remove-your-google-web-history/