The site, Social Media Security, does a good job unpacking Facebook’s plans for sharing identity info with other sites. That this is continuous with Facebook’s moves to push more data into the public doesn’t make it any less troubling. This isn’t as concerning as Beacon but I suspect it has the potential to back fire in a very similar way.
What is worse is that theharmonyguy points out that Facebook didn’t actually have to change anything for much of your profile data to be available to other sites. Some of that is intentional, most of it is not.
I especially like his references to Kim Cameron and Danah Boyd. Both speak well to our more nuanced expectations around privacy and the handling of our information. To paraphrase Boyd, our posting of public info is not equivalent with an expectation that the info will be publicized, making it more public violates our privacy expectations.