If Facebook thought it had a lot of privacy-related legal trouble on its plate, it hasn't seen anything yet. Researchers commissioned by Belgium's data protection agency have determined that Facebook's latest web tracking policy violates European Union privacy law. Reportedly, the social network uses cookies to track web visitors without permission, whether or not they log in or take advantage of the EU's proposed opt-out rules. Cookies are only supposed to be used when you're signed in, and only for things you've agreed to. The kicker? The opt-out system that Facebook uses appears to put another tracking cookie on your system if you're in the EU, so you never completely escape.