facebook/open-graph-protocol — pull request #15 by niallkennedy (2012-01-11 18:51:43+00:00)
Title: Update ogp.me to OGP 1.1

I noticed ogp.me does not practice what it preaches. XML namespaces instead of prefixes, some room for structured properties in the logo image, and generally setting a good example by integrating some of the things advocated on the page.

Includes an update to the latest version of [PHP Markdown](https://github.com/michelf/php-markdown/), recently upgraded for some regex conflicts in PHP 5.3.

Updated the [Facebook Like social plugin](https://developers.facebook.com/docs/reference/plugins/like/) iframe based on output from the generator. If Chartbeat gets a script then Facebook Like might be worthy of a script in place of the iframe for improved functionality.

Some PHP style changes. I used long tags in place of short tags. I built a full path to the intended file instead of relying on a relative path since in my experience there can be conflicts with other PHP include paths depending on the system and packages.