Say, list of hashtags.
Or better yet, a set of kind 30xxx list of hashtags / npubs.
For instance, a "topical" feed for "sports I'm interested in" might be hashtags
NHL + TampaBayLightning + NYislandsrs. But not "LA Kings"
And just text notes, no reposts. And filter everything for Web of Trust > 1 or whatever.
Only Coracle can do anything close to that.