Someone recently asked if there was a neat way to see where all of the now broken down subreddits moved.
Some moved to Discord, some to Lemmy, and some are somewhere else.
This seems to be a good place to find your communities again: https://sub.rehab/
I really wish there was a way to save posts. I guess this comment will have to do!
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A folder of bookmarks also works. It’s old fashioned of course…
If you upvote the post, it will show in your favorites
If you’re on mobile, Jerboa on Android allows you to save posts. I don’t remember what the iOS equivalent app is but I’ve heard it’s good.