Is there any good reason why we disallow OpenGraphs from pages with no title? This seems kinda silly to me.

Also, note that a page with <meta property="og:title" content="" /> (for example, an untitled blog post) will not use the page <title> instead, since empty strings are truthy in Ruby.

Finally, there's no reason not to at least use site_name in place of OEmbed's provider_name afaict.