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Google collects a ton of information about your browsing habits. If you are pro-Google, then you will accept this collection is used to provide you with the best search results possible. They have the ability to filter results not just by location but pretty much by any factor you can view in Google Analytics. If you type in "Clear browser cache", Google KNOWS what browser you are using and can add the "Firefox" term in on your behalf, without it being apparent to the user. Take a close look at the wealth of information offered in GA. I recently searched for some lightbulbs online. Now, whatever said I visit shows lightbulb ads. Google KNOWS I am a possible lightbulb customer. When the CIA wants information on someone, they go to Google.