My new found bug or error is that, when viewing facebook newsfeed in Mozilla firefox, it redirects to the blog and the video will play there.. Chrome and IE plays the newsfeed video well inside facebook itself.
Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains.