Open Graph Pro is a WordPress plugin.
It adds Open Graph Protocol metadata to your WordPress powered blog/website. It does not (yet) add any Facebook “Like” buttons.
The Open Graph Protocol enables your website/blog to have the same functionality as a Facebook page.
Open Graph Pro is hosted on wordpress.org:
Version 1.1 will feature an API for theme and plugin developers to access the Open Graph Protocol metadata to add “Like” buttons to their blogs and to use custom Object Types. Go to the download page and grab the Development Version if you want to try it!