A few ways to find hidden RSS feeds by manipulating URLs.

The easy ones

For a bunch of platforms, it is enough to append something at the end of the profile/channel/topic’s URL:

  • Mastodon and Reddit: .rss
  • Bluesky and Tumblr: /rss
  • Pinterest: /feed.rss

The annoying ones

YouTube

  1. open a video of the channel you want to follow
  2. open the page source (on Firefox: right click + V)
  3. search for the channelID
  4. append it to 
     https://www.youtube.com/feeds/videos.xml?channel_id=

Sources: