If you have a facebook widget published and it is not appearing on your page, here is the answer most people....
- Log into Facebook as an administrator of your Facebook Page.
- Go to your FB Page that you are trying to display using the widget.
- Once on your Facebook Page, click on "Edit Page" located at the top in the Admin Panel.
- Then click on "Edit Settings".
- Then, on the settings page... find the field titled "Country Restrictions".
- You need to make certain there are absolutely NO COUNTRIES LISTED in this setting. If your page is restricted to "United States", you need to remove that and re-save the settings.