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Bewenched - 3:14 am on Nov 8, 2012 (gmt 0)
Use this up in your header to have the image appear for goog and facebook.
<LINK REL="image_src" href="http://www.example.com/myimage.jpg">
Just be aware that using the markup for rich snippets and product data will drive more bots to your site and 99% of them would be scrapers. We're battling that now.