02 Apr 2011
... without shoving your copyright into Zuckerberg'ass; I prefer to host my content on my server and rather just post a link.
According to stackoverflow , use
<head> <link rel="image_src" href="http://stackoverflow.com/images/logo.gif" /> </head>to indicate the image which should appear as a thumbnail.
The facebook URL linter (http://developers.facebook.com/tools/lint/) allows to preview how your link is rendered.