WordPress SEO by Yoast not generating Facebook snippet

This plugin worked great for a while, but recently it stopped generating a snippet on Facebook. I then stopped adding the “/” to the URL and Facebook would then generate the snippet. Now it’s not generating the snippet at all. When I paste a link into FB, it just generates a snippet showing the URL.

I suspect that I may have broken something, but I have no idea where to look.

I’ve enabled the open graph stuff on the Social tab in the WordPress SEO plugin, and I restored all of the settings of the plugin back to defaults. Still no luck.

Any help would be appreciated! I’ve searched and searched and finally decided to post here as a last resort.