How come Indiegogo links shared on G+ link to their page instead of displaying URL?

Posted by Ivan Vucica on Pro Webmasters See other posts from Pro Webmasters or by Ivan Vucica
Published on 2014-03-03T21:22:23Z Indexed on 2014/06/02 3:59 UTC
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If an Indiegogo link, such as this one, gets shared on G+, their G+ page is displayed in the post in the place where commonly the URL would be displayed.

I've tried looking analyzing the HTML, but came up empty handed: there's Twitter cards metadata, there's OpenGraph, there is a G+ button -- but I found nothing that links to Indiegogo's page, not even rel="publisher".

So, how does Indiegogo achieve this?

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