original post discovery: not finding original post on facebook posts

[aaronpk]

Given this original post: http://aaronparecki.com/notes/2014/06/05/2/chirpify

and this Facebook post: https://www.facebook.com/aaronpk/posts/10101454731717886

bridgy is not correctly finding the original post from the Facebook post. Instead it's trying to send the webmention only to the shrturl.co URL. However it is correctly finding the Twitter versions of the post.

[aaronpk]

This is the same issue as #171

I added the Twitter syndication link first, then the Facebook one after, and Bridgy probably scanned my post when there was only the Twitter link.