I have the widget set up and working the way I want it to, and it fetches posts from FB just fine. The only problem is that clicking any of the links on the images or in the description results in an error 500.
The website encountered an error while retrieving https://www.facebook.com/l.php?u=http%3A%2F%2Fgoo.gl%2F4HN28&h=XAQEcA4sU&s=1. It may be down for maintenance or configured incorrectly.
Here are some suggestions:
Reload this webpage later.
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.