[facebook] How does Facebook Sharer select Images and other metadata when sharing my URL?

As of 2013, if you're using facebook.com/sharer.php (PHP) you can simply make any button/link like:

<a class="btn" target="_blank" href="http://www.facebook.com/sharer.php?s=100&amp;p[title]=<?php echo urlencode(YOUR_TITLE);?>&amp;p[summary]=<?php echo urlencode(YOUR_PAGE_DESCRIPTION) ?>&amp;p[url]=<?php echo urlencode(YOUR_PAGE_URL); ?>&amp;p[images][0]=<?php echo urlencode(YOUR_LINK_THUMBNAIL); ?>">share on facebook</a>

Link query parameters:

p[title] = Define a page title
p[summary] = An URL description, most likely describing the contents of the page
p[url] = The absolute URL for the page you're sharing 
p[images][0] = The URL of the thumbnail image to be used as post thumbnail on facebook

It's plain simple: you do not need any js or other settings. Is just an HTML raw link. Style the A tag in any way you want to.

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