I had to dig for it, but apparently they use "a Microsoft Bing API and some in-house information." https://www.networkworld.com/article/2188911/million-short-sh

I had to dig for it, but apparently they use "a Microsoft Bing API and some in-house information." https://www.networkworld.com/article/2188911/million-short-showcases-the-web-s-supporting-cast.html https://www.networkworld.com/article/2188911/million-short-s... I should edit the Wikipedia page; it makes it sound like they rolled their own engine and crawler, which seemed pretty unlikely.