<p>Couldn't the  opengraph <code>og:image</code> tag URL point to the export API, eg <a href="http://render.openstreetmap.org/cgi-bin/export?bbox=14.414062499999998,46.00280468514235,14.558258056640623,46.106922264575914&scale=48033&format=png">http://render.openstreetmap.org/cgi-bin/export?bbox=14.414062499999998,46.00280468514235,14.558258056640623,46.106922264575914&scale=48033&format=png</a></p>

<p>I do realize this could be a performance issue, but nothing that some caching couldn't resolve. (Facebook likely caches the images themselves)</p>

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