Access Tokens. An access token is an opaque string that identifies a user, app, or Page and can be used by the app to make graph API calls. When someone connects with an app using Facebook Login and approves the request for permissions, the app obtains an access token that provides temporary, secure access to Facebook APIs. Pages Manager for Facebook is the only fully featured Facebook Pages Manager app on Windows that you can use to manage all your Facebook pages. The app allows you to post, delete or share your pages status, upload photos, send and receive messages from your pages, comment on your posts or reply to a comment and a lot more. For more information about permissions, see Permissions with Facebook Login. The largest number of permissions is requested through Facebook Login, but some are requested through Instagram. In addition, businesses holding a system_user token and so functioning as a user can grant permissions through Business Manager.