Tumblr theming - show preview image for “link” post type?

Question

When you add a \"link\" type post to Tumblr:

...your admin shows a small thumbnail of any image as

Answer 1

Tumblr Link Theme Operator and Thumbnail

Tumblr recently added some new theme operators to allow for link thumbnails.

I presume this works the same as video thumbnails work and may only be available if the linked site creates the thumbnail.

{block:Link}
{block:Thumbnail}

{/block:Thumbnail}
{/block:Link}

Reference: http://www.tumblr.com/docs/en/custom_themes#link-posts