What Information Is Available Through Facebook Connect?
Facebook Connect was launched in 2008 as a way to make it easier for Facebook users to log into external websites. With the Facebook login button now appearing on many websites, you don't have to remember separate usernames and passwords for every site. Although you have some control over which parts of your profile these sites can access, the data-sharing platform has caused some privacy concerns.
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Permission
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When you click the Facebook login button on another site, you are prompted to enter your Facebook login information if you're not already logged in. Then you are asked to deny or allow the site to access your personal information. The dialog box displays what the site is asking permission to do, such as posting on your wall or viewing your friends list.
Information Types
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At the very least, you must generally grant external sites permission to access your basic profile information, such as your name and user ID, to use Facebook Connect. Any information that you designate as being open to everyone in your privacy settings is included in the basic information category. The stricter your privacy settings, the less information that is available to external sites by default.
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Limiting Access
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If you want to use Facebook Connect but don't want external sites posting to your wall or performing other actions, you can limit their permissions in your privacy settings under "Apps and Websites." Click "Edit Settings" next to an individual website, then click "Remove" next to any optional information types. Some information, such as the basic profile details, is required by the applications and can't be removed except by revoking the site from Facebook Connect entirely.
Alternative
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If you don't want websites to access the information they require to use Facebook Connect, you can click "Remove App" on the Apps Settings page to revoke their access to your account. You won't be able to use Facebook Connect to log into these sites without giving them access; however, most sites allow you to register a separate account without using Facebook to log in.
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