The Open Graph Protocol is a new methodology for storing metadata to make it easier for third party sites (think the Facebook LIKE button) to identify relevant content on yo
If each like button is associated with an item on the same page, then header of each item could link through to a page for just that item. That page could carry all the meta tags for the item and like button would use the url of that page. I did this here http://cinema-shorts.org/past/ (P.S. this is the first proper website Ive built so if its broken please forgive me)