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I believe it's likely that most users will indeed construct an echo chamber. It's very easy to do by accident; most people won't intentionally follow people who share stuff they don't like. I suspect that since the feed shown to logged-out users will be biased according to the collective preferences of the established userbase, it will form a reinforcing effect as new users show up and either participate or decline to participate based upon the content of the site at first glance. There will always be space for 'alternative' views on hubski but they will get harder and harder to find.