It probably makes use of the https://brid.gy https://brid.gy gateway to display content from silos such as Twitter. This is an intended usecase of the indieweb

It probably makes use of the https://brid.gy https://brid.gy gateway to display content from silos such as Twitter. This is an intended usecase of the indieweb, see https://indieweb.org/backfeed https://indieweb.org/backfeed Implementing webmentions on your website is not hard. But if you don't want to selfhost your own webmention endpoint (or can't), take a look at webmention.io (that plays well with bridgy) to host your webmentions and expose a JSON API. This API allows you for example, when a building a page, to query the API for webmentions related to this piece of content so you can display those interactions nicely as on the original article linked.