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Indeed, I often have to make a conscious effort not to construct an echo chamber, and I occasionally stumble upon a new user or tag and think "How am I not already following this?" The answer, of course, is that I was content in my own bubble and it became difficult to break out of. Perhaps the feed shown to logged-out users needs (more) randomization? Maybe some sort of algorithm to ensure it shows posts from different "cliques" of users?