What is exposed about you and your friends when you login with Facebook

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When you log in to a service with Facebook, the company exposes an enormous amount of sensitive personal information to the service's operator -- everything from your political views to your relationship status. What's more, logging into a service with Facebook also exposes your contacts' personal information to the service: their locations, political views, organizations, religion, and more.

...and here's what a brand knows when you login via facebook (via Dan Hon)