<blockquote>
<p>We can implement 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.</p>
</blockquote>

<p>This probably belongs outside the rails port, which doesn't do anything with tile rendering. </p>

<p>The tile.openstreetmap.org servers provide the /cgi-bin/export endpoint, but it's <a href="http://wiki.openstreetmap.org/wiki/Tile_usage_policy">not suitable for this</a>.</p>

<p>MapQuest Open provides the full featured <a href="http://open.mapquestapi.com/staticmap/">Static Map</a> endpoint which would work for this.</p>

<p><a href="https://github.com/gravitystorm" class="user-mention">@gravitystorm</a>, do your layers have any suitable similar endpoint?</p>

<p>For layers without a static endpoint, the best option might be to take the tile from four zoom levels up, to get a 256x256 preview.</p>

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