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However if the site doesn't support RSS themselves you can try to use third party tools like https://nitter.net/ for Twitter or https://openrss.org/ for many sites and services. You can also use "Feed Builder" tools that can build a feed by scraping the sites. These tools are generally less reliable than first-party RSS but can work really well for filling in gaps.
Detailed answers below, but my main suggestion is to install some addon that detects RSS feeds. I use RSSHub Radar but there are other options.
https://github.com/RSS-Bridge/rss-bridge/issues Facebook and Instagram will delete your account if you do this.