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You are the barrier to entry. Who and what you follow is what builds your feed. If you consistently see unsavory users in your feed you can "ignore" and or "mute" them. You can do the same with URL's and tags. In short, if your feed sucks, take stock of why and change it. erin is right, whether or not we can maintain this overall culture is the measure of success though, from where I sit. But, should the idiots intrude conceivably you may not even notice.