I guess, the question is: what would you like to use Open Graph for? What is your intent?

There are couple of tutorials on how to incorporate Open Graph directly in the theme

Tutorial 1
Tutorial 2

Smallworld already is using opengraph in sense of bookmarking updates is rendering Ogg and Fb metas when submitting.

When shared you can in your facebook/twitter/g+ like/unlike/share or whatever.

I was thinking though to add a search filter to see how many people had shared every particular update in the social networks but finally I descided it would make the update's tool-line too busy.

For what purpose is it needed, what does it need to show ?