I\'m building an app that allows users to administrate their Facebook Fan Pages. This requires the following two Access Tokens:
Facebook page access token is very similar to User access token except that "it impersonates the user" as the admin of the page and allows to manage it [manage_page permission is required].
If Offline_access permission is granted to the app the page access_token WILL NOT expire (unless the user changes their password or manually deauthorises the app)
Use the following link to check the details of an issued access token.
https://developers.facebook.com/tools/debug/