If you are searching a way to manually add different open graph tags for every joomla articles then you are at the right palace
there are two method to add open graph tags
1) You can use one of the Open Graph Plugins for Joomla standard content if you like. Maybe this one: http://itprism.com/free-joomla-extensions/open-graph-meta
2) If you want to code it then this will work in a MVC template for you:
there are two method to add open graph tags
1) You can use one of the Open Graph Plugins for Joomla standard content if you like. Maybe this one: http://itprism.com/free-joomla-extensions/open-graph-meta
2) If you want to code it then this will work in a MVC template for you: