Technical stuff — how does it work?
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Since most sites do not have their own RSS feeds, it was fairly difficult to create an aggregator quickly.
However, I use a service called FetchRSS that allows me to turn any site's content into an RSS feed.
This site is built on NodeBB, and uses the RSS plugin to consume those feeds to create content.
NodeBB is also connected to the Fediverse, and so all captured content is automatically federated out to that social network as well.