For the title of this HN submission, the text is from the og:description tag in the page's html. I'm not sure how the popular websites were selected. Perhaps

For the title of this HN submission, the text is from the og:description tag in the page's html. I'm not sure how the popular websites were selected. Perhaps the author of the site can answer your question in the comments of the corresponding blog post. http://www.catonmat.net/blog/announcing-techurls/ http://www.catonmat.net/blog/announcing-techurls/