Enabling Facebook Like on your Virtuemart Site The following is a tutorial on getting the Facebook Like button working on your Virtuemart product pages using the XFBML version of the Like button and the freely available open source VM Open Graph and, optionally, the VM Add Canonical extensions. This tutorial is current for Joomla 1.5, Virtuemart 1.1.8, and VM Open Graph v1.8. Why is the Open Graph plugin required? Anyone who has tried to enable the Facebook Like button in Virtuemart will have noticed that without the Open Graph tags, Facebook will randomly pick an image from the product page to use when it is posted to the user’s wall. In my case, this was more often than not the Paypal logo; not exactly the desired result. The only way to tell Facebook which image it should use is with the og:image tag. Of course, the problem is: each product needs the contents of this tag to point to its own image file. So how do you dynamically populate this tag for each unique product? The VM Ope...