The content of Open Graph meta tags is not generated automatically out of page content. Administrators can edit the content manually.
The Global Open Graph plugin is compatible with all other open graph plugins which add tags with autogenerated content.
Unfortunately, the content of the tags are not extracted from the webpage itself, but is configured in the back end and is the same for all pages. This limits the added value sgnificantly. For the applications I know, it is useless.
sorry, but you dont understand the usage of this plugin and does not read the discription full!