<blockquote>
<p>However, we could designate a particular well mapped area as the preview image, e.g. Berlin, or the full extent</p>
</blockquote>
<p>I see three options for this issue.</p>
<ol>
<li>generate some static image for the <code>og:image</code> tag on pages where the map is being browsed;</li>
<li>take a tile from the center of the viewport at zoom-3, which isn't quite the same as what the user is seeing; or</li>
<li>decide that "it needs a new function to generate thumbnail on-fly, containing small version of current view of the map and then place it in html's og:image", which requires mainly work outside the scope of the rails port, and close this issue</li>
</ol>

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