Facebook does not use the Facebook ID grabbed out of the URL in its feed. It uses the numerical version of your ID. This is why you are getting an empty feed when you check "Only show posts made by this Facebook ID." If you give me the Facebook ID you grabbed out of the URL, I can give you the correct numerical Facebook ID.
If you are not comfortable giving me your Facebook ID, you can get the correct numerical version by doing the following:
- Go to http://developers.facebook.com/tools/explorer.
- Enter your access token.
- In the field with “https://graph.facebook.com/” in it, enter “FACEBOOK_ID_FROM_URL/feed” after it so that it reads “https://graph.facebook.com/FACEBOOK_ID_FROM_URL/feed”
- Click submit.
- In the results, the first data entry is “id”. It has your Facebook ID followed by an underscore followed by another number.
- Enter your numerical Facebook ID on the settings page for the plugin and click "Save Changes."