---- Yandex Introduces Interactive Snippets "Islands" To SERPs
lucy24 - 8:02 am on Jun 9, 2013 (gmt 0)
Ah, now that you bring it up I do remember that description:
A post to Google+ that include a link renders a preview, or snippet, that contains the page title, a brief description of the page, and a thumbnail image.
How it contrives to render a thumbnail image when all it has ever downloaded is the raw html must remain an impenetrable mystery ... alongside the equally impenetrable mystery of who, exactly, would have put up a link to my test site.