Simple OpenGraph metadata lookup written in Node.js. Built in 30 minutes after Programming Social Web Applications presentation from Jonathan LeBlanc at ConvergeSE. Uses JSDOM to parse DOM. Built on Express.
Here is an example lookup of mailchimp.com: http://og-quickcheck.herokuapp.com/?url=http%3A%2F%2Fmailchimp.com
This is a proof of concept, it is incomplete and easy to break. Here is a blog post about it.