‘…unlike things being adjacent to each other.’
Great comments. Even without algorithms, this can be trouble—on subreddits, posts can be flagged ‘offtopic’—so overboard moderation is a problem. (Of course, Reddit is where one goes to fully ‘engage’. No /s—it’s fine to do that. Problem is: people may not know where to go to get outside of ‘engage’ mode.)
One thought I’ll add re: getting outside of my own interests—I think if we had better tools for keeping tabs on our interests, we could more easily move outside them. (Like: if my ‘reader’/‘news feed’ makes it difficult to track 100 people, then I can’t very well track 1,000 people.)
And directories are sweet here—they are little libraries. Sure, they can cover your interests. But they can be used to map the strange elven lands that you happen to sally in.