We don't have plans right now to integrate with Virtuemart, but if you have a developer who can add a few lines of code to your site, posting a message to a user's wall is pretty simple. In the future, we're going to be working on a tag that you can attach to buttons (like 'checkout') that will pop-up a "Post to Wall" box which can be filled in with some data. It's a ways off, but we want to make it much easier to get posts out to your users from your site. Our next big goals with JFBConnect are just this type of integration for better feedback between Facebook and your site.
For information on how to post now, see the snippet "How do I post to a user's wall from other components?"
www.sourcecoast.com/extensions/jfbconnec...on-support-questions
Hope this helps, and we hope to make this process even easier in the future!