If it’s only for Facebook purposes that you need it, you could add the following code to your header.php file (between <head> and </head>):
<meta property="og:image" content="http://ia.media-imdb.com/rock.jpg"/>
Of course replace the URL in content="..." with your own image URL.
A reference for all the Facebook meta tags is here: http://developers.facebook.com/docs/opengraphprotocol/
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