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I remember using machine tags Last.fm back, back in the day (late 00s, maybe even 2010). That was still the time of the mashup/remixed web pages, and APIs were more open and you could do very fun stuff crossing Google Maps, Facebook, Craigslist and whatever.
Then, Last.fm was a good site to keep track of the events (concerts/festivals) you were planning to go or you had visited.
Every event had an ID (let's say, 3792998), and you could add photos to Flickr with a machine tag with certain prefix (in this case, the tag would be lastfm:event=3792998). So, when you visited an event on Last.fm, it'd query the Flickr API for photos tagged with that machine tag, and show photos from that concert.
It was cool, but I think Last.fm removed that feature at least 10 years ago...
Here you can still list Flickr photos tagged like that:
https://flickr.com/photos/tags/lastfm:event=*
Edit: Oh, I didn't remember that Flickr would also link back to the Last.fm event. The Internet was quite a different thing back then. Flickr blog post about the feature: https://code.flickr.net/2008/08/28/machine-tags-lastfm-and-r...
But the site doesn't say anything about being new, and in fact says it was invented in 1995:
When Was 3D-Knitting Invented?
The concept of 3D-knitting was first envisioned and then developed by the
Japanese company SHIMA SEIKI. They launched their first WHOLEGARMENT knitting
machine at the ITMA trade fair in 1995.This project is an enhanced reader for Ycombinator Hacker News: https://news.ycombinator.com/.
The interface also allow to comment, post and interact with the original HN platform. Credentials are stored locally and are never sent to any server, you can check the source code here: https://github.com/GabrielePicco/hacker-news-rich.
For suggestions and features requests you can write me here: gabrielepicco.github.io