I was an early adopter. In the beginning, there was actually a handful of us reviewing avatars and assigning ratings. Now it&#x27;s just kind of left up to trust.<p>I don&#x27;t think it was an Automattic project at first, so I doubt it&#x27;s built on WordPress. But it&#x27;s probably built on PHP and MySQL, with a <i>ton</i> of caching in front of it.<p>It wouldn&#x27;t surprise me if it leverages WordPress.com&#x27;s CDN.