I have said this on HN several times, and I will say this again. Dragnet surveillance of private digital correspondence by the US and other governments is wrong, and a gross, unjustified, overreaction to the real threat of terrorism. And yet, when taken as part of the whole picture that is the internet, government surveillance is little more than a drop in the ocean. While governments may collect a possibly significa…
When you use Gmail you are sending your mail to Google, first, and then it is relayed to the recipients. When you search for driving directions to an address, you are sending data to Google that says "I want to know how to drive/cycle/walk to X location right now". When you search for some phrase you are sending a request to Google that says "I want to know about this".
There is no reason why they wouldn't hold onto that data. You sent it to them, because you want the response that they can provide. It's an exchange.