The scope to use when authenticating to Facebook.
The scope that are used when authenticating to Facebook give your App access to request additional information that may be required for certain tables. Individual scope may be entered in a comma separated list. Leaving it blank will use the defaults. The Scope is only used if you have specified your own OAuthClientId and OAuthClientSecret.
Requesting Additional Permissions
You may find while using the provider that Facebook returns an error stating your app does not have permissions to do a certain action. To resolve this, you will need to generate a new OAuth access token with the required scope. Set the Scope property in the authentication step for a desktop application.
Web applications need to call the GetOAuthAuthorizationURL and GetOAuthAccessToken stored procedures, which have inputs for the scope you would like to request.
Note that these are comma-separated lists of scopes, so you can request more than one per authorization request. You can find a list of available Facebook scopes here: http://developers.facebook.com/docs/authentication/permissions/.