As of today, the new Facebook privacy setting called "Instant Personalization" goes into effect.
The new setting shares your data with non-Facebook websites & it is automatically set to "Enabled".
To disable: Go to Account>Privacy Settings>Apps & Websites>Instant Personalization>edit settings & uncheck "Enable".
Apparently if your friends have this enabled, their profile will be sharing your information too. So it's best to pass this on and try to get as many of your friends as possible to disable this new feature.