Facebook Connect authentication settings are located in Site Manager -> Settings -> Social networks -> Facebook. Before you start adjusting the settings, make sure you have the right site selected using the Site drop-down list at the top left part of the page.
•API key - key obtained during registration of your application on Facebook (as described in Registering your application topic).
•Application secret - key obtained during registration of your application on Facebook.
The two following settings are not required for Facebook Connect authentication. They are used only for the purposes of auto-posting on a website's Facebook page.
•Facebook Page ID - Specifies the Page ID (approximately 15 digits) obtained from the URL of the Facebook page associated with the website.
•Access token - Click the Get button to retrieve a token from Facebook after confirming permissions for the application. The API key, Application secret and Facebook Page ID fields must be filled in. When the token is retrieved, you can see it's expiration date. After it expires or when auto-posting is no longer functional, click the Get button again to renew the token.
•Enable Facebook Connect - indicates if Facebook Connect authentication is enabled.
•Assign new users to roles - new users registered via Facebook Connect will be assigned to these roles.
•Required user data page - URL of the page where the Facebook Connect required data web part resides. If entered and a new Facebook Connect user logs in to the site, their user account is not created automatically, but they are redirected to this page and required to enter some additional data (or merge with an existing account) using the web part.
•URL shortener - May be used to select a URL shortening service that will be used for all links in Facebook posts.