With this extension you are able to add several open graph tags to your website.
There are several details, which can be specified inside the edit form of a general contao page.
This Open Graph plugin inserts metadata into your website which are rendered from the page specifications.
The Open Graph Protocol allowes a web page to become a rich object in a social graph. For example, this is used on Facebook or Google+ to allow a website to have the same functionality as any other object there.