Seems there are a lot of possibilities with the Open Graph Protocol. I have been looking to add it to one of my Zen Cart sites. Thing is the 'Like' button is very easy to add as the iframe code can be added to the product HTML description. Problem is adding the meta-tags. Zen Cart pulls most of its header info from a header.html file - most of the meta info is kept here. The meta info is the same across the entire site. However as I understand it the Open Graph meta info is unique to the page - not the website. Zen Cart gives you very little control over the page meta info. So any ideas if the Open Graph meta tags can be used with Zen Cart, and if so how?