People seek out online groups of like-minded people that replicate communities that have always characterized human society. These groups in turn become more connected but less open, choosing their preferred channel and the people they want to interact with. They share information based only on a single vantage point. As in the real world, people can be quick to believe the worst about others, especially people they perceive as different from them. People’s defense mechanisms start to kick in. Idealism, in short, collides with human nature. Who figured this out and capitalized on it before
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