John Gruber in “The Plus in Google Plus”:
The conventional wisdom about Google is that they’re selling our privacy to advertisers. That’s no longer a fringe opinion — it’s the consensus. They’re breeding resentment.
The ironic thing is that they're not actually doing this. Google never, ever, gives your data to advertisers – it's way too valuable for that. What it does is give access to audiences, which is a very different thing.