you can't be sure of that anymore. and even if you could, consider this:

google has already accumulated cosmic amounts of data about each and every one of his users. that's a huge DB with personal data, trends, conversations, intimate knowledge, insider knowledge, and the possibility to extrapolate things for market researches, product placement, but also demographic issues and tons of other stuff.

now, google, as big and powerful as they already are, WILL one day start lobbying YOUR government for legal use and distribution of this data, and one day get that law passed, reducing privacy to zero. (you're 90% there already btw)

it's not about single pieces of information, or me (an individual) spying on you (an individual).
it's about a company that'll probably survive it's founders, with other people taking over who might not be so keen on a goody-goody image. but then google already will hold so freaking much information it's basically up to their goodwill not to abuse it. and i am not comfortable with that, because at some point, someone WILL want to abuse it. it's human nature, greed is part of it.
not to mention one or several google employees could go astray...


seriously, i am time and time again shocked how little people care about these things. they say they haven't done anything wrong or got nothing to hide... well, they're wrong!

take this simplest of all examples: you get a serious disease some day. it might be lethal or not, rare or not, doesn't matter.
you google about it, write gmails to your friends about it. now, google has that information. and they don't delete it. they mine such data.
now imagine, what a huuuge set of mined data like this would be worth to big employers. they could filter out candidates unbelievably easy, even if your disease wasn't serious, you're not even being considered for the job, and you never know what happened.

even if stuff like this doesn't happen right now (examples from asia show google is not too far from it), it WILL happen in the not-so-far future if we aren't careful.