The Facebook URL linter is a tool that helps you to debug Open Graph webpages, pages with embedded like button or with other social plugins.
The Open Graph Protocol Open Source Community developped other tools and parsers for php, java, python, ruby, json to check Open Graph webpages.
It’s even possible to see how many URL’s of pages that are not part of the Facebook Open Graph have been shared by using the API request :
More details are provided by the API request
Insights provides analytics on a Facebook Page, app and website. The Insights Dashboard makes it easy to see how Facebook users are interacting with your content, and the Insights APIs allow developers to obtain additional statistics and integrate the data with third party reporting systems.