Why did you make that data available? Do you not want others to see it? If you didn't, then why did you put it out there for others to see?
Also, you know that privacy controls are taken into account right? So if you don't make certain data available to certain people, you don't show up in searches for those people....
I think you're being a bit irrational when you say that you're "being used".
This graph search is just the last straw. It is terrifying the repercussions this search engine could have, and I believe this blog post shows some great examples.
This open graph search will be great for marketing purposes, and a silly tool for us users. I guarantee there are going to be some serious consequences of companies/governments having the power to instantly search and sort billion's of users' data. And maybe you'll say that some great findings can come from this search; maybe we can learn more about humans and societies with this tool? Maybe, but I believe the cost outweighs the benefits.
I've noticed this argument more often w.r.t FB and other such privacy issues. I think it's flawed.
I joined FB back when it was closed. In my mind I wasn't putting anything 'out there' for the world. The first time they made things public and started messing with the default privacy settings I was worried but gave them the benefit of the doubt. Then the cycle repeated with new features and settings, which were altered from their previous states. From that point on I realised they didn't actually care about privacy the way I understand the term and they've gone on to 'open-up' more and more (rather aggressively in my view). What used to be hidden (or at least you thought it was) essentially becomes public at some point in the future.
Had I known this was the direction FB was taking I would have treated it as a public site from the very beginning. Twitter on the other hand was public from the beginning, so my interactions there have been different. I think it's unreasonable to expect that Joe Bloggs out there can get his head around what's public/private on FB. Even if they do there's no telling what might change in the future.
Of course, I could leave FB but then I'd lose touch with people. So now I leave my profile alone, hardly ever 'like' anything and generally try and limit what I do there. I'm sure FB still gleans plenty of info about me from whatever my friends do (i.e tagging photos, connecting address books etc).