For the personalized feeds, you could curate both content & algo for each.

1) memes:

- all memes, excluding nsfw

- ranked by engagement volume

2) (protocol) news

- few credible sources

- ranked by recency

3) Instagram/photos from friends

- excluding nsfw

4) "global" (not seen yet)

- all my follows, excluding the cache of already seen notes

- ranked by engagement