From the files of the Facebook's Tenuous Grasp on Privacy Dept: Numerous users saw their email addresses revealed on their public Facebook pages for about 30 minutes last night.
It's a small window of time, and, as some commenters pointed out, spammers probably already have your email address. But Facebook, at least during the lapse, didn't offer an option to hide that email address, you must have an email address registered to use Facebook, and, as the Buzz rollout showed, many people try to hold their personal email addresses close to their chest.
Have privacy concerns ever left you at least considering a switch from Facebook, or at least a profile pare-down? [Defamer]