Here's some more info on the new features in an article about Mark Zuckerberg's non belief in privacy.
Quote:
Then last week at its f8 conference, Facebook announced it was sending user profile information in bulk to companies like Yelp, Pandora and Microsoft. Thus, when users show up at those sites while logged in to Facebook, they see personalized versions of the those services (unless the user opts out of each site, somewhere deep in the bowels of Facebook’s privacy control center). On Tuesday, four Senators asked the company to only push data to third-parties if users agree to it, a so-called “opt-in” that social networking sites like Facebook, Twitter and Google Buzz eschew since it radically cuts down on participation and thus revenues.
Facebook is also pushing a “Like” button, which lets sites put little Facebook buttons on anything from blog entries to T-shirts in web stores.
Clicking that button sends that information to Facebook, which publishes it as part of what it calls the Open Graph, linking your identity to things you choose online. That information, in turn, is shared with whatever sites Facebook chooses to share it with — and to the sites you’ve allowed to access your profile.
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I bolded the part I was thinking was true earlier. If you log out of FB before logging into other sites you're data does not get compiled.
The info on the 'like' button is some of the clearest I've seen. Solution - don't 'like' anything on FB.