----- Original Message -----
From: "Roan Kattouw" roan.kattouw@gmail.com
Presumably it'll pass a referer header, which means the 3rd-party site would know who (IP and account, if they have one on their site, like on Facebook) visited which Wikipedia page when. I'm not very familiar with the privacy policy, but I'm pretty sure this is shady at the very least.
If Wikipedia or any other WMF sites deploy anything remotely related to Facebook, be it Instant Personalization, or even anything slightly less intrusive, then I'm gone, both as a reader and an editor, and I'm pretty sure I wouldn't be alone in that opinion. Mission creep is alive and well at Facebook.
Papa *spank*.
Cheers, -- jra