I'm actually less concerned about Google having my data than, say Facebook. Google already has a ton of my data, but they don't sell it off to third parties. They practically define the analytics and targeted advertising. Facebook's problem is that they can't figure out how to actually make money with the data they have so they're resorting to selling it to third parties (Google, Bing, Yelp, Pandora, CNN, etc). That is what scares me at least.