The Facebook Panopticon, Part 4
I visited Le Monde, browsed a few articles, closed the tab, did some more browsing on Boingboing and links from there, and went to Facebook by typing www.facebook.com in the URL bar. Facebook suddenly thinks my primary language is French and presents me with "Bienvenue sur Facebook!"
So, what the hell? I probably got a cookie from Le Monde, but I thought cookies were not supposed to be exposed to sites other than the URL that they are for. They could be using the .visited CSS hack to detect that I have visited a well-known French website, but they should also be picking up on the BBC and a few Spanish and Russian newspapers that I've thrown into Google Translate. Or it could just be a bug in their system.
See also earlier