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Re:Google ToS rated: “keeps your searches and logs for an un... by asperous on Saturday May 04, 2013 @10:11PM (#5657173)
I can see from an clean request to google.com that they set two cookies on your browser that are set to expires 6 months from the last request to google.com.

So assuming you use google more than once every 6 months they can keep a running log of your searches, and as soon as you log in to any google service with that cookie they will associate it with your account (I'm guessing).

If you clear your cookies reguarly or use incogneto it's not an issue.

Re:Google ToS rated: “keeps your searches and logs for an un... by dustcoin on Saturday May 04, 2013 @11:06PM (#5657297)
Even without cookies, Google stores IP addresses and can use those to correlate searches.
Re:Google ToS rated: “keeps your searches and logs for an un... by bchar on Saturday May 04, 2013 @11:28PM (#5657347)
IP address seems incredibly unreliable in this regard. What exactly is to be gained by associating it with an IP? If a company uses one external IP, are all my searches altered/bubbled by what everybody else in the company is querying?
Re:Google ToS rated: “keeps your searches and logs for an un... by zwegner on Sunday May 05, 2013 @02:01AM (#5657588)
There's a lot more information than just IP address they can use to distinguish you: https://panopticlick.eff.org/