Jerry on Mastodon#Piefed (#Reddit alternative), and #Lemmy and #MBIN alternative too, has added a nice new feature called "Feeds" which is like multi-reddit. You can create your own public feeds by combining a number of communities together. People on any other Piefed instance can subscribe to your feed.
If you're interested in using Piefed as a Reddit alternative, or checking out this feature, I run a public instance, https://feddit.online. You can see all Piefed server choices at https://join.piefed.social/try/
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