Participants tend to friend like-minded people, follow others with similar interests, and turn to news sources that represent their own particular worldview. With such restricted interactions, the many people engaged on-line fragment into distinct, non-interacting populations within which they rarely encounter an objectionable point of view.
When presented with many very similar options and positions, people are remarkably quick to learn to discern them and place moral judgements on them. Even as we sort ourselves into increasingly homogenous groups, we still have deep divisions without our group, just over increasingly trivial issues.
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Brian
