As of 21st April, there is a new privacy setting
that allows non-Facebook pages to share your information - to
switch it off go to Account -> Privacy Settings ->
Applications and Websites -> Instant Personalisation and uncheck
"allow" - you might also want to review the settings for "What your
friends can share about you"
HOW TO: Disable Facebook's
If you're uncomfortable with Facebook's new features for privacy reasons, you can opt of the them by adjusting your privacy settings.