Nope. I'm not. Yes, privacy is important. However, the only information that I've ever put on Facebook is information that I'd want everyone else to know. That's why I have a Facebook; to give people who don't know me an idea of who I am and what I'm like, and get a little bit of personal branding out there. For instance, there's at least one little portion of my life that I don't want to be broadcast out to everyone…
This was actually how Facebook got popular in the first place. The whole point was that it was more private than the other social networks out there. As the site grew, one of its big selling points was its privacy control panel, which gave you granular control over how your content was shared.
Perhaps the perception has changed in the last year or two, but I think a lot of people signed up under the impression that Facebook is a safe/private site.