İntegration Facebook commenting to native app

I am developing a native Android app using the Iconic framework, and want to connect some app pages with Facebook commenting using the Open Graph protocol. It is important for our project that we do not simply iFrame web pages into our app. We are scraping content from a website, and want to reference the scraped pages’ URLs in Open Graph’s og:URL parameter.

The first challenge we have, though, is making a connection between our app and Facebook using Open Graph. Can anyone point me in the right direction?