In its default settings, the plugin can NOT be used with a personal or restricted Facebook page since these pages require an access token to retrieve information.
Only public pages that belong to an organization/business or pages that are set up as fan pages can be used without an access token. However, since version 4.0, the plugin does allow you to provide Facebook APP data, which will then be used to retrieve an access token. This NOT an advertised feature of the plugin since it can not be guaranteed to work.
Please have in mind that access tokens have a maximum life of 60 days; therefore, every 60 days, the access token must be refreshed every 60 days.